55811251 has 2 divisors, whose sum is σ = 55811252. Its totient is φ = 55811250.

The previous prime is 55811243. The next prime is 55811263. The reversal of 55811251 is 15211855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55811251 - 2³ = 55811243 is a prime.

It is a super-2 number, since 2×55811251² = 6229791476370002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55811551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27905625 + 27905626.

It is an arithmetic number, because the mean of its divisors is an integer number (27905626).

Almost surely, 2^55811251 is an apocalyptic number.

55811251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55811251 is an equidigital number, since it uses as much as digits as its factorization.

55811251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000, while the sum is 28.

The square root of 55811251 is about 7470.6928058916. The cubic root of 55811251 is about 382.1559148086.

The spelling of 55811251 in words is "fifty-five million, eight hundred eleven thousand, two hundred fifty-one".