155941657 has 2 divisors, whose sum is σ = 155941658. Its totient is φ = 155941656.

The previous prime is 155941567. The next prime is 155941699. The reversal of 155941657 is 756149551.

Together with previous prime (155941567) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84437721 + 71503936 = 9189^2 + 8456^2 .

It is a cyclic number.

It is not a de Polignac number, because 155941657 - 2¹⁹ = 155417369 is a prime.

It is a super-4 number, since 4×155941657⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (155941057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77970828 + 77970829.

It is an arithmetic number, because the mean of its divisors is an integer number (77970829).

Almost surely, 2^155941657 is an apocalyptic number.

It is an amenable number.

155941657 is a deficient number, since it is larger than the sum of its proper divisors (1).

155941657 is an equidigital number, since it uses as much as digits as its factorization.

155941657 is an odious number, because the sum of its binary digits is odd.

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

The square root of 155941657 is about 12487.6601891627. The cubic root of 155941657 is about 538.2541432738.

The spelling of 155941657 in words is "one hundred fifty-five million, nine hundred forty-one thousand, six hundred fifty-seven".