155956601 has 2 divisors, whose sum is σ = 155956602. Its totient is φ = 155956600.

The previous prime is 155956597. The next prime is 155956609. The reversal of 155956601 is 106659551.

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., 135117376 + 20839225 = 11624^2 + 4565^2 .

It is a cyclic number.

It is not a de Polignac number, because 155956601 - 2² = 155956597 is a prime.

It is a super-2 number, since 2×155956601² = 48644922790946402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155956609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77978300 + 77978301.

It is an arithmetic number, because the mean of its divisors is an integer number (77978301).

Almost surely, 2^155956601 is an apocalyptic number.

It is an amenable number.

155956601 is a deficient number, since it is larger than the sum of its proper divisors (1).

155956601 is an equidigital number, since it uses as much as digits as its factorization.

155956601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 155956601 is about 12488.2585255111. The cubic root of 155956601 is about 538.2713364839.

The spelling of 155956601 in words is "one hundred fifty-five million, nine hundred fifty-six thousand, six hundred one".