155045551 has 2 divisors, whose sum is σ = 155045552. Its totient is φ = 155045550.

The previous prime is 155045521. The next prime is 155045563. The reversal of 155045551 is 155540551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155045551 - 2⁵ = 155045519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155045521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77522775 + 77522776.

It is an arithmetic number, because the mean of its divisors is an integer number (77522776).

Almost surely, 2^155045551 is an apocalyptic number.

155045551 is a deficient number, since it is larger than the sum of its proper divisors (1).

155045551 is an equidigital number, since it uses as much as digits as its factorization.

155045551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12500, while the sum is 31.

The square root of 155045551 is about 12451.7288357882. The cubic root of 155045551 is about 537.2211509083.

The spelling of 155045551 in words is "one hundred fifty-five million, forty-five thousand, five hundred fifty-one".