55161251 has 4 divisors (see below), whose sum is σ = 55707504. Its totient is φ = 54615000.

The previous prime is 55161247. The next prime is 55161257. The reversal of 55161251 is 15216155.

55161251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 55161251 - 2² = 55161247 is a prime.

It is a super-2 number, since 2×55161251² = 6085527223770002, 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 55161251.

It is not an unprimeable number, because it can be changed into a prime (55161257) 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 3 ways as a sum of consecutive naturals, for example, 272975 + ... + 273176.

It is an arithmetic number, because the mean of its divisors is an integer number (13926876).

Almost surely, 2^55161251 is an apocalyptic number.

55161251 is a deficient number, since it is larger than the sum of its proper divisors (546253).

55161251 is a wasteful number, since it uses less digits than its factorization.

55161251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546252.

The product of its digits is 1500, while the sum is 26.

The square root of 55161251 is about 7427.0620705633. The cubic root of 55161251 is about 380.6665379337. Note that the first 3 decimals are identical.

The spelling of 55161251 in words is "fifty-five million, one hundred sixty-one thousand, two hundred fifty-one".