51490693 has 4 divisors (see below), whose sum is σ = 51602368. Its totient is φ = 51379020.

The previous prime is 51490667. The next prime is 51490697. The reversal of 51490693 is 39609415.

51490693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51490693 - 2⁵ = 51490661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51490697) by changing a digit.

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, 55143 + ... + 56068.

It is an arithmetic number, because the mean of its divisors is an integer number (12900592).

Almost surely, 2^51490693 is an apocalyptic number.

It is an amenable number.

51490693 is a deficient number, since it is larger than the sum of its proper divisors (111675).

51490693 is a wasteful number, since it uses less digits than its factorization.

51490693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111674.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 51490693 is about 7175.7015684879. The cubic root of 51490693 is about 372.0285295305.

The spelling of 51490693 in words is "fifty-one million, four hundred ninety thousand, six hundred ninety-three".