641156247 has 12 divisors (see below), whose sum is σ = 927370704. Its totient is φ = 426857760.

The previous prime is 641156233. The next prime is 641156287. The reversal of 641156247 is 742651146.

641156247 is a `hidden beast` number, since 641 + 1 + 5 + 6 + 2 + 4 + 7 = 666.

641156247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641156247 - 2⁴ = 641156231 is a prime.

It is a super-2 number, since 2×641156247² = 822162666134250018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641156227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41254 + ... + 54627.

It is an arithmetic number, because the mean of its divisors is an integer number (77280892).

Almost surely, 2^641156247 is an apocalyptic number.

641156247 is a deficient number, since it is larger than the sum of its proper divisors (286214457).

641156247 is a wasteful number, since it uses less digits than its factorization.

641156247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96630 (or 96627 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 641156247 is about 25321.0633070572. The cubic root of 641156247 is about 862.2925343472.

The spelling of 641156247 in words is "six hundred forty-one million, one hundred fifty-six thousand, two hundred forty-seven".