55071251 has 2 divisors, whose sum is σ = 55071252. Its totient is φ = 55071250.

The previous prime is 55071239. The next prime is 55071257. The reversal of 55071251 is 15217055.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55071251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55071251.

It is not a weakly prime, because it can be changed into another prime (55071257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27535625 + 27535626.

It is an arithmetic number, because the mean of its divisors is an integer number (27535626).

Almost surely, 2^55071251 is an apocalyptic number.

55071251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55071251 is an equidigital number, since it uses as much as digits as its factorization.

55071251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 55071251 is about 7421.0006737636. Note that the first 3 decimals coincide. The cubic root of 55071251 is about 380.4593959192.

The spelling of 55071251 in words is "fifty-five million, seventy-one thousand, two hundred fifty-one".