51351979 has 4 divisors (see below), whose sum is σ = 58687984. Its totient is φ = 44015976.

The previous prime is 51351977. The next prime is 51351983. The reversal of 51351979 is 97915315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51351979 - 2¹ = 51351977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51351977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667992 + ... + 3668005.

It is an arithmetic number, because the mean of its divisors is an integer number (14671996).

Almost surely, 2^51351979 is an apocalyptic number.

51351979 is a deficient number, since it is larger than the sum of its proper divisors (7336005).

51351979 is an equidigital number, since it uses as much as digits as its factorization.

51351979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336004.

The product of its digits is 42525, while the sum is 40.

The square root of 51351979 is about 7166.0295143127. The cubic root of 51351979 is about 371.6941521050.

The spelling of 51351979 in words is "fifty-one million, three hundred fifty-one thousand, nine hundred seventy-nine".