51213797 has 16 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 45682560.

The previous prime is 51213793. The next prime is 51213821. The reversal of 51213797 is 79731215.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51213797 - 2² = 51213793 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 (51213793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21458 + ... + 23724.

It is an arithmetic number, because the mean of its divisors is an integer number (3572100).

Almost surely, 2^51213797 is an apocalyptic number.

It is an amenable number.

51213797 is a deficient number, since it is larger than the sum of its proper divisors (5939803).

51213797 is a wasteful number, since it uses less digits than its factorization.

51213797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its digits is 13230, while the sum is 35.

The square root of 51213797 is about 7156.3815577427. The cubic root of 51213797 is about 371.3604578607.

The spelling of 51213797 in words is "fifty-one million, two hundred thirteen thousand, seven hundred ninety-seven".