51497213 has 2 divisors, whose sum is σ = 51497214. Its totient is φ = 51497212.

The previous prime is 51497197. The next prime is 51497263. The reversal of 51497213 is 31279415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39400729 + 12096484 = 6277^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 51497213 - 2⁴ = 51497197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51497213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51497263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25748606 + 25748607.

It is an arithmetic number, because the mean of its divisors is an integer number (25748607).

Almost surely, 2^51497213 is an apocalyptic number.

It is an amenable number.

51497213 is a deficient number, since it is larger than the sum of its proper divisors (1).

51497213 is an equidigital number, since it uses as much as digits as its factorization.

51497213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 51497213 is about 7176.1558650854. The cubic root of 51497213 is about 372.0442315502.

The spelling of 51497213 in words is "fifty-one million, four hundred ninety-seven thousand, two hundred thirteen".