51990814 has 4 divisors (see below), whose sum is σ = 77986224. Its totient is φ = 25995406.

The previous prime is 51990797. The next prime is 51990847. The reversal of 51990814 is 41809915.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12997702 + ... + 12997705.

It is an arithmetic number, because the mean of its divisors is an integer number (19496556).

Almost surely, 2^51990814 is an apocalyptic number.

51990814 is a deficient number, since it is larger than the sum of its proper divisors (25995410).

51990814 is a wasteful number, since it uses less digits than its factorization.

51990814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25995409.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 51990814 is about 7210.4655882959. The cubic root of 51990814 is about 373.2291356390.

The spelling of 51990814 in words is "fifty-one million, nine hundred ninety thousand, eight hundred fourteen".