155313551 has 2 divisors, whose sum is σ = 155313552. Its totient is φ = 155313550.

The previous prime is 155313523. The next prime is 155313563.

155313551 is nontrivially palindromic in base 10.

155313551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155313551 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155313451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77656775 + 77656776.

It is an arithmetic number, because the mean of its divisors is an integer number (77656776).

Almost surely, 2^155313551 is an apocalyptic number.

155313551 is a deficient number, since it is larger than the sum of its proper divisors (1).

155313551 is an equidigital number, since it uses as much as digits as its factorization.

155313551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5625, while the sum is 29.

The square root of 155313551 is about 12462.4857472336. The cubic root of 155313551 is about 537.5305060025.

The spelling of 155313551 in words is "one hundred fifty-five million, three hundred thirteen thousand, five hundred fifty-one".