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661012441 = 5431121711
BaseRepresentation
bin100111011001100…
…011111111011001
31201001210220121021
4213121203333121
52323204344231
6145331442441
722244340655
oct4731437731
91631726537
10661012441
1130a140481
12165456421
13a6c3b62b
1463b09a65
153d070811
hex27663fd9

661012441 has 4 divisors (see below), whose sum is σ = 661139584. Its totient is φ = 660885300.

The previous prime is 661012427. The next prime is 661012463. The reversal of 661012441 is 144210166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144210166 = 272105083.

It is a cyclic number.

It is not a de Polignac number, because 661012441 - 29 = 661011929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661015441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55425 + ... + 66286.

It is an arithmetic number, because the mean of its divisors is an integer number (165284896).

Almost surely, 2661012441 is an apocalyptic number.

It is an amenable number.

661012441 is a deficient number, since it is larger than the sum of its proper divisors (127143).

661012441 is a wasteful number, since it uses less digits than its factorization.

661012441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127142.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 661012441 is about 25710.1622126349. The cubic root of 661012441 is about 871.1037389571.

The spelling of 661012441 in words is "six hundred sixty-one million, twelve thousand, four hundred forty-one".

Divisors: 1 5431 121711 661012441