651438157 has 2 divisors, whose sum is σ = 651438158. Its totient is φ = 651438156.

The previous prime is 651438143. The next prime is 651438191. The reversal of 651438157 is 751834156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 533194281 + 118243876 = 23091^2 + 10874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651438157 is a prime.

It is equal to p_33864484 and since 651438157 and 33864484 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651438127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325719078 + 325719079.

It is an arithmetic number, because the mean of its divisors is an integer number (325719079).

Almost surely, 2^651438157 is an apocalyptic number.

It is an amenable number.

651438157 is a deficient number, since it is larger than the sum of its proper divisors (1).

651438157 is an equidigital number, since it uses as much as digits as its factorization.

651438157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 651438157 is about 25523.2865634502. The cubic root of 651438157 is about 866.8775003008.

The spelling of 651438157 in words is "six hundred fifty-one million, four hundred thirty-eight thousand, one hundred fifty-seven".