51136994 has 4 divisors (see below), whose sum is σ = 76705494. Its totient is φ = 25568496.

The previous prime is 51136991. The next prime is 51137033. The reversal of 51136994 is 49963115.

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., 29560969 + 21576025 = 5437^2 + 4645^2 .

It is a super-2 number, since 2×51136994² = 5229984310712072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51136991) by changing a digit.

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, 12784247 + ... + 12784250.

Almost surely, 2^51136994 is an apocalyptic number.

51136994 is a deficient number, since it is larger than the sum of its proper divisors (25568500).

51136994 is a wasteful number, since it uses less digits than its factorization.

51136994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568499.

The product of its digits is 29160, while the sum is 38.

The square root of 51136994 is about 7151.0134946034. The cubic root of 51136994 is about 371.1747275281.

The spelling of 51136994 in words is "fifty-one million, one hundred thirty-six thousand, nine hundred ninety-four".