51626489 has 2 divisors, whose sum is σ = 51626490. Its totient is φ = 51626488.

The previous prime is 51626483. The next prime is 51626521. The reversal of 51626489 is 98462615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29376400 + 22250089 = 5420^2 + 4717^2 .

It is a cyclic number.

It is not a de Polignac number, because 51626489 - 2⁸ = 51626233 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51626483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25813244 + 25813245.

It is an arithmetic number, because the mean of its divisors is an integer number (25813245).

Almost surely, 2^51626489 is an apocalyptic number.

It is an amenable number.

51626489 is a deficient number, since it is larger than the sum of its proper divisors (1).

51626489 is an equidigital number, since it uses as much as digits as its factorization.

51626489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 51626489 is about 7185.1575487250. The cubic root of 51626489 is about 372.3552917485.

The spelling of 51626489 in words is "fifty-one million, six hundred twenty-six thousand, four hundred eighty-nine".