51505942 has 8 divisors (see below), whose sum is σ = 79751232. Its totient is φ = 24922200.

The previous prime is 51505921. The next prime is 51505967. The reversal of 51505942 is 24950515.

51505942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51505942² = 5305724122614728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 415309 + ... + 415432.

It is an arithmetic number, because the mean of its divisors is an integer number (9968904).

Almost surely, 2^51505942 is an apocalyptic number.

51505942 is a deficient number, since it is larger than the sum of its proper divisors (28245290).

51505942 is a wasteful number, since it uses less digits than its factorization.

51505942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830774.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 51505942 is about 7176.7640340198. The cubic root of 51505942 is about 372.0652513973.

The spelling of 51505942 in words is "fifty-one million, five hundred five thousand, nine hundred forty-two".