51448979 has 4 divisors (see below), whose sum is σ = 54156840. Its totient is φ = 48741120.

The previous prime is 51448967. The next prime is 51448993. The reversal of 51448979 is 97984415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51448979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51448909) 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, 1353902 + ... + 1353939.

It is an arithmetic number, because the mean of its divisors is an integer number (13539210).

Almost surely, 2^51448979 is an apocalyptic number.

51448979 is a deficient number, since it is larger than the sum of its proper divisors (2707861).

51448979 is a wasteful number, since it uses less digits than its factorization.

51448979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707860.

The product of its digits is 362880, while the sum is 47.

The square root of 51448979 is about 7172.7943648204. The cubic root of 51448979 is about 371.9280389382.

The spelling of 51448979 in words is "fifty-one million, four hundred forty-eight thousand, nine hundred seventy-nine".