51975394 has 4 divisors (see below), whose sum is σ = 77963094. Its totient is φ = 25987696.

The previous prime is 51975389. The next prime is 51975403. The reversal of 51975394 is 49357915.

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

It can be written as a sum of positive squares in only one way, i.e., 50594769 + 1380625 = 7113^2 + 1175^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51975394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12993847 + ... + 12993850.

Almost surely, 2^51975394 is an apocalyptic number.

51975394 is a deficient number, since it is larger than the sum of its proper divisors (25987700).

51975394 is a wasteful number, since it uses less digits than its factorization.

51975394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25987699.

The product of its digits is 170100, while the sum is 43.

The square root of 51975394 is about 7209.3962299211. The cubic root of 51975394 is about 373.1922332076.

The spelling of 51975394 in words is "fifty-one million, nine hundred seventy-five thousand, three hundred ninety-four".