155916457 has 2 divisors, whose sum is σ = 155916458. Its totient is φ = 155916456.

The previous prime is 155916443. The next prime is 155916461. The reversal of 155916457 is 754619551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131354521 + 24561936 = 11461^2 + 4956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155916457 is a prime.

It is not a weakly prime, because it can be changed into another prime (155916487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77958228 + 77958229.

It is an arithmetic number, because the mean of its divisors is an integer number (77958229).

Almost surely, 2^155916457 is an apocalyptic number.

It is an amenable number.

155916457 is a deficient number, since it is larger than the sum of its proper divisors (1).

155916457 is an equidigital number, since it uses as much as digits as its factorization.

155916457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 43.

The square root of 155916457 is about 12486.6511523306. The cubic root of 155916457 is about 538.2251479530.

The spelling of 155916457 in words is "one hundred fifty-five million, nine hundred sixteen thousand, four hundred fifty-seven".