51409131 has 4 divisors (see below), whose sum is σ = 68545512. Its totient is φ = 34272752.

The previous prime is 51409103. The next prime is 51409133. The reversal of 51409131 is 13190415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51409131 - 2¹⁹ = 50884843 is a prime.

It is a super-2 number, since 2×51409131² = 5285797500350322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51409133) 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, 8568186 + ... + 8568191.

It is an arithmetic number, because the mean of its divisors is an integer number (17136378).

Almost surely, 2^51409131 is an apocalyptic number.

51409131 is a deficient number, since it is larger than the sum of its proper divisors (17136381).

51409131 is a wasteful number, since it uses less digits than its factorization.

51409131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17136380.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51409131 is about 7170.0161087685. The cubic root of 51409131 is about 371.8319928703.

Adding to 51409131 its reverse (13190415), we get a palindrome (64599546).

The spelling of 51409131 in words is "fifty-one million, four hundred nine thousand, one hundred thirty-one".