51245591 has 2 divisors, whose sum is σ = 51245592. Its totient is φ = 51245590.

The previous prime is 51245569. The next prime is 51245609. The reversal of 51245591 is 19554215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51245591 - 2¹⁴ = 51229207 is a prime.

It is a super-2 number, since 2×51245591² = 5252221193878562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51245501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622795 + 25622796.

It is an arithmetic number, because the mean of its divisors is an integer number (25622796).

Almost surely, 2^51245591 is an apocalyptic number.

51245591 is a deficient number, since it is larger than the sum of its proper divisors (1).

51245591 is an equidigital number, since it uses as much as digits as its factorization.

51245591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The square root of 51245591 is about 7158.6025870976. The cubic root of 51245591 is about 371.4372899686.

The spelling of 51245591 in words is "fifty-one million, two hundred forty-five thousand, five hundred ninety-one".