51390797 has 4 divisors (see below), whose sum is σ = 51469440. Its totient is φ = 51312156.

The previous prime is 51390793. The next prime is 51390811. The reversal of 51390797 is 79709315.

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 51390797 - 2² = 51390793 is a prime.

It is a super-3 number, since 3×51390797³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51390791) 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, 38333 + ... + 39650.

It is an arithmetic number, because the mean of its divisors is an integer number (12867360).

Almost surely, 2^51390797 is an apocalyptic number.

It is an amenable number.

51390797 is a deficient number, since it is larger than the sum of its proper divisors (78643).

51390797 is an equidigital number, since it uses as much as digits as its factorization.

51390797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78642.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 51390797 is about 7168.7374760135. The cubic root of 51390797 is about 371.7877855593.

The spelling of 51390797 in words is "fifty-one million, three hundred ninety thousand, seven hundred ninety-seven".