55121251 has 2 divisors, whose sum is σ = 55121252. Its totient is φ = 55121250.

The previous prime is 55121243. The next prime is 55121267. The reversal of 55121251 is 15212155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55121251 - 2³ = 55121243 is a prime.

It is a super-3 number, since 3×55121251³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (55121201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27560625 + 27560626.

It is an arithmetic number, because the mean of its divisors is an integer number (27560626).

Almost surely, 2^55121251 is an apocalyptic number.

55121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55121251 is an equidigital number, since it uses as much as digits as its factorization.

55121251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500, while the sum is 22.

The square root of 55121251 is about 7424.3687273734. The cubic root of 55121251 is about 380.5745026538.

The spelling of 55121251 in words is "fifty-five million, one hundred twenty-one thousand, two hundred fifty-one".