51113639 has 2 divisors, whose sum is σ = 51113640. Its totient is φ = 51113638.

The previous prime is 51113633. The next prime is 51113663. The reversal of 51113639 is 93631115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51113639 is a prime.

It is a super-2 number, since 2×51113639² = 5225208183644642, 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 (51113633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25556819 + 25556820.

It is an arithmetic number, because the mean of its divisors is an integer number (25556820).

Almost surely, 2^51113639 is an apocalyptic number.

51113639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51113639 is an equidigital number, since it uses as much as digits as its factorization.

51113639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 29.

The square root of 51113639 is about 7149.3803227972. The cubic root of 51113639 is about 371.1182119795.

The spelling of 51113639 in words is "fifty-one million, one hundred thirteen thousand, six hundred thirty-nine".