155252251 has 16 divisors (see below), whose sum is σ = 195487488. Its totient is φ = 119772000.

The previous prime is 155252243. The next prime is 155252261. The reversal of 155252251 is 152252551.

It is a cyclic number.

It is not a de Polignac number, because 155252251 - 2³ = 155252243 is a prime.

It is a super-2 number, since 2×155252251² = 48206522881134002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155252261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2205 + ... + 17758.

It is an arithmetic number, because the mean of its divisors is an integer number (12217968).

Almost surely, 2^155252251 is an apocalyptic number.

155252251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155252251 is a deficient number, since it is larger than the sum of its proper divisors (40235237).

155252251 is a wasteful number, since it uses less digits than its factorization.

155252251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20082.

The product of its digits is 5000, while the sum is 28.

The square root of 155252251 is about 12460.0261235681. The cubic root of 155252251 is about 537.4597782053.

The spelling of 155252251 in words is "one hundred fifty-five million, two hundred fifty-two thousand, two hundred fifty-one".