641154457 has 4 divisors (see below), whose sum is σ = 643243216. Its totient is φ = 639065700.

The previous prime is 641154419. The next prime is 641154523. The reversal of 641154457 is 754451146.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641154457 is a prime.

It is a super-2 number, since 2×641154457² = 822158075461929698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641154407) 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, 1043919 + ... + 1044532.

It is an arithmetic number, because the mean of its divisors is an integer number (160810804).

Almost surely, 2^641154457 is an apocalyptic number.

It is an amenable number.

641154457 is a deficient number, since it is larger than the sum of its proper divisors (2088759).

641154457 is a wasteful number, since it uses less digits than its factorization.

641154457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088758.

The product of its digits is 67200, while the sum is 37.

The square root of 641154457 is about 25321.0279609656. The cubic root of 641154457 is about 862.2917318881.

The spelling of 641154457 in words is "six hundred forty-one million, one hundred fifty-four thousand, four hundred fifty-seven".