51642979 has 2 divisors, whose sum is σ = 51642980. Its totient is φ = 51642978.

The previous prime is 51642977. The next prime is 51643037. The reversal of 51642979 is 97924615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51642979 - 2¹ = 51642977 is a prime.

Together with 51642977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51642971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821489 + 25821490.

It is an arithmetic number, because the mean of its divisors is an integer number (25821490).

Almost surely, 2^51642979 is an apocalyptic number.

51642979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51642979 is an equidigital number, since it uses as much as digits as its factorization.

51642979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 51642979 is about 7186.3049615223. The cubic root of 51642979 is about 372.3949321557.

The spelling of 51642979 in words is "fifty-one million, six hundred forty-two thousand, nine hundred seventy-nine".