155905951 has 2 divisors, whose sum is σ = 155905952. Its totient is φ = 155905950.

The previous prime is 155905949. The next prime is 155905961. The reversal of 155905951 is 159509551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155905951 - 2¹ = 155905949 is a prime.

Together with 155905949, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155905931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77952975 + 77952976.

It is an arithmetic number, because the mean of its divisors is an integer number (77952976).

Almost surely, 2^155905951 is an apocalyptic number.

155905951 is a deficient number, since it is larger than the sum of its proper divisors (1).

155905951 is an equidigital number, since it uses as much as digits as its factorization.

155905951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50625, while the sum is 40.

The square root of 155905951 is about 12486.2304559863. The cubic root of 155905951 is about 538.2130587429.

The spelling of 155905951 in words is "one hundred fifty-five million, nine hundred five thousand, nine hundred fifty-one".