155161551 has 4 divisors (see below), whose sum is σ = 206882072. Its totient is φ = 103441032.

The previous prime is 155161549. The next prime is 155161577.

155161551 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 155161551 - 2¹ = 155161549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155165551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25860256 + ... + 25860261.

It is an arithmetic number, because the mean of its divisors is an integer number (51720518).

Almost surely, 2^155161551 is an apocalyptic number.

155161551 is a deficient number, since it is larger than the sum of its proper divisors (51720521).

155161551 is an equidigital number, since it uses as much as digits as its factorization.

155161551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51720520.

The product of its digits is 3750, while the sum is 30.

The square root of 155161551 is about 12456.3859525948. The cubic root of 155161551 is about 537.3550945961.

The spelling of 155161551 in words is "one hundred fifty-five million, one hundred sixty-one thousand, five hundred fifty-one".