649912157 has 8 divisors (see below), whose sum is σ = 685759200. Its totient is φ = 614229264.

The previous prime is 649912139. The next prime is 649912169. The reversal of 649912157 is 751219946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649912157 - 2⁶ = 649912093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649912177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32858 + ... + 48779.

It is an arithmetic number, because the mean of its divisors is an integer number (85719900).

Almost surely, 2^649912157 is an apocalyptic number.

It is an amenable number.

649912157 is a deficient number, since it is larger than the sum of its proper divisors (35847043).

649912157 is a wasteful number, since it uses less digits than its factorization.

649912157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82075.

The product of its digits is 136080, while the sum is 44.

The square root of 649912157 is about 25493.3747667899. The cubic root of 649912157 is about 866.2000815102.

The spelling of 649912157 in words is "six hundred forty-nine million, nine hundred twelve thousand, one hundred fifty-seven".