155938961 has 2 divisors, whose sum is σ = 155938962. Its totient is φ = 155938960.

The previous prime is 155938931. The next prime is 155938963. The reversal of 155938961 is 169839551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104673361 + 51265600 = 10231^2 + 7160^2 .

It is a cyclic number.

It is not a de Polignac number, because 155938961 - 2¹⁸ = 155676817 is a prime.

Together with 155938963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155938963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77969480 + 77969481.

It is an arithmetic number, because the mean of its divisors is an integer number (77969481).

Almost surely, 2^155938961 is an apocalyptic number.

It is an amenable number.

155938961 is a deficient number, since it is larger than the sum of its proper divisors (1).

155938961 is an equidigital number, since it uses as much as digits as its factorization.

155938961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 47.

The square root of 155938961 is about 12487.5522421330. The cubic root of 155938961 is about 538.2510413840.

The spelling of 155938961 in words is "one hundred fifty-five million, nine hundred thirty-eight thousand, nine hundred sixty-one".