51100621 has 8 divisors (see below), whose sum is σ = 60034464. Its totient is φ = 42881520.

The previous prime is 51100619. The next prime is 51100631. The reversal of 51100621 is 12600115.

It is a happy number.

51100621 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 51100621 - 2¹ = 51100619 is a prime.

It is a super-2 number, since 2×51100621² = 5222546933171282, 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 = 51100595 and 51100604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51100601) 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, 178531 + ... + 178816.

It is an arithmetic number, because the mean of its divisors is an integer number (7504308).

Almost surely, 2^51100621 is an apocalyptic number.

It is an amenable number.

51100621 is a deficient number, since it is larger than the sum of its proper divisors (8933843).

51100621 is a wasteful number, since it uses less digits than its factorization.

51100621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357371.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 51100621 is about 7148.4698362657. The cubic root of 51100621 is about 371.0867029264.

Adding to 51100621 its reverse (12600115), we get a palindrome (63700736).

The spelling of 51100621 in words is "fifty-one million, one hundred thousand, six hundred twenty-one".