51220031 has 8 divisors (see below), whose sum is σ = 54346464. Its totient is φ = 48106240.

The previous prime is 51219983. The next prime is 51220033. The reversal of 51220031 is 13002215.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51220031 is a prime.

It is a super-2 number, since 2×51220031² = 5246983151281922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51219988 and 51220015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5966 + ... + 11748.

It is an arithmetic number, because the mean of its divisors is an integer number (6793308).

Almost surely, 2^51220031 is an apocalyptic number.

51220031 is a deficient number, since it is larger than the sum of its proper divisors (3126433).

51220031 is a wasteful number, since it uses less digits than its factorization.

51220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6321.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 51220031 is about 7156.8170998007. The cubic root of 51220031 is about 371.3755252013.

Adding to 51220031 its reverse (13002215), we get a palindrome (64222246).

The spelling of 51220031 in words is "fifty-one million, two hundred twenty thousand, thirty-one".