51346581 has 16 divisors (see below), whose sum is σ = 80431680. Its totient is φ = 28725120.

The previous prime is 51346543. The next prime is 51346591. The reversal of 51346581 is 18564315.

It is not a de Polignac number, because 51346581 - 2⁶ = 51346517 is a prime.

It is a super-2 number, since 2×51346581² = 5272942760779122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51346591) 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, 59416 + ... + 60273.

It is an arithmetic number, because the mean of its divisors is an integer number (5026980).

Almost surely, 2^51346581 is an apocalyptic number.

It is an amenable number.

51346581 is a deficient number, since it is larger than the sum of its proper divisors (29085099).

51346581 is a wasteful number, since it uses less digits than its factorization.

51346581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119716.

The product of its digits is 14400, while the sum is 33.

The square root of 51346581 is about 7165.6528662781. The cubic root of 51346581 is about 371.6811277751.

The spelling of 51346581 in words is "fifty-one million, three hundred forty-six thousand, five hundred eighty-one".