155025251 has 4 divisors (see below), whose sum is σ = 155393904. Its totient is φ = 154656600.

The previous prime is 155025229. The next prime is 155025257. The reversal of 155025251 is 152520551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155025251 is a prime.

It is a super-2 number, since 2×155025251² = 48065656895226002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155025251.

It is not an unprimeable number, because it can be changed into a prime (155025257) 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, 183695 + ... + 184536.

It is an arithmetic number, because the mean of its divisors is an integer number (38848476).

Almost surely, 2^155025251 is an apocalyptic number.

155025251 is a deficient number, since it is larger than the sum of its proper divisors (368653).

155025251 is an equidigital number, since it uses as much as digits as its factorization.

155025251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368652.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 155025251 is about 12450.9136612539. The cubic root of 155025251 is about 537.1977038949.

The spelling of 155025251 in words is "one hundred fifty-five million, twenty-five thousand, two hundred fifty-one".