51769639 has 2 divisors, whose sum is σ = 51769640. Its totient is φ = 51769638.

The previous prime is 51769637. The next prime is 51769667. The reversal of 51769639 is 93696715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51769639 - 2¹ = 51769637 is a prime.

Together with 51769637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51769631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25884819 + 25884820.

It is an arithmetic number, because the mean of its divisors is an integer number (25884820).

Almost surely, 2^51769639 is an apocalyptic number.

51769639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51769639 is an equidigital number, since it uses as much as digits as its factorization.

51769639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 46.

The square root of 51769639 is about 7195.1121603489. The cubic root of 51769639 is about 372.6991299015.

The spelling of 51769639 in words is "fifty-one million, seven hundred sixty-nine thousand, six hundred thirty-nine".