661031417 has 4 divisors (see below), whose sum is σ = 699915636. Its totient is φ = 622147200.

The previous prime is 661031407. The next prime is 661031419. The reversal of 661031417 is 714130166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 305935081 + 355096336 = 17491^2 + 18844^2 .

It is a cyclic number.

It is not a de Polignac number, because 661031417 - 2⁴ = 661031401 is a prime.

It is a super-2 number, since 2×661031417² = 873925068522055778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661031417.

It is not an unprimeable number, because it can be changed into a prime (661031419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19442084 + ... + 19442117.

It is an arithmetic number, because the mean of its divisors is an integer number (174978909).

Almost surely, 2^661031417 is an apocalyptic number.

It is an amenable number.

661031417 is a deficient number, since it is larger than the sum of its proper divisors (38884219).

661031417 is a wasteful number, since it uses less digits than its factorization.

661031417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38884218.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 661031417 is about 25710.5312469424. The cubic root of 661031417 is about 871.1120746077.

The spelling of 661031417 in words is "six hundred sixty-one million, thirty-one thousand, four hundred seventeen".