51390619 has 4 divisors (see below), whose sum is σ = 58732144. Its totient is φ = 44049096.

The previous prime is 51390617. The next prime is 51390629. The reversal of 51390619 is 91609315.

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

It is not a de Polignac number, because 51390619 - 2¹ = 51390617 is a prime.

It is a super-2 number, since 2×51390619² = 5281991442406322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51390617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3670752 + ... + 3670765.

It is an arithmetic number, because the mean of its divisors is an integer number (14683036).

Almost surely, 2^51390619 is an apocalyptic number.

51390619 is a deficient number, since it is larger than the sum of its proper divisors (7341525).

51390619 is an equidigital number, since it uses as much as digits as its factorization.

51390619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7341524.

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

The square root of 51390619 is about 7168.7250609854. The cubic root of 51390619 is about 371.7873563106.

The spelling of 51390619 in words is "fifty-one million, three hundred ninety thousand, six hundred nineteen".