51105979 has 2 divisors, whose sum is σ = 51105980. Its totient is φ = 51105978.

The previous prime is 51105941. The next prime is 51106009. The reversal of 51105979 is 97950115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51105979 is a prime.

It is a super-2 number, since 2×51105979² = 5223642179096882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51100979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25552989 + 25552990.

It is an arithmetic number, because the mean of its divisors is an integer number (25552990).

Almost surely, 2^51105979 is an apocalyptic number.

51105979 is a deficient number, since it is larger than the sum of its proper divisors (1).

51105979 is an equidigital number, since it uses as much as digits as its factorization.

51105979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 51105979 is about 7148.8445919603. The cubic root of 51105979 is about 371.0996721952.

It can be divided in two parts, 51 and 105979, that added together give a triangular number (106030 = T₄₆₀).

The spelling of 51105979 in words is "fifty-one million, one hundred five thousand, nine hundred seventy-nine".