51990136 has 16 divisors (see below), whose sum is σ = 106343640. Its totient is φ = 23631840.

The previous prime is 51990119. The next prime is 51990163. The reversal of 51990136 is 63109915.

51990136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295311 + ... + 295486.

Almost surely, 2^51990136 is an apocalyptic number.

It is an amenable number.

51990136 is an abundant number, since it is smaller than the sum of its proper divisors (54353504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51990136 is a wasteful number, since it uses less digits than its factorization.

51990136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590814 (or 590810 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 51990136 is about 7210.4185731482. The cubic root of 51990136 is about 373.2275132341.

The spelling of 51990136 in words is "fifty-one million, nine hundred ninety thousand, one hundred thirty-six".