51969629 has 4 divisors (see below), whose sum is σ = 55026684. Its totient is φ = 48912576.

The previous prime is 51969623. The next prime is 51969637. The reversal of 51969629 is 92696915.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37185604 + 14784025 = 6098^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 51969629 - 2⁴ = 51969613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51969623) 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, 1528502 + ... + 1528535.

It is an arithmetic number, because the mean of its divisors is an integer number (13756671).

Almost surely, 2^51969629 is an apocalyptic number.

It is an amenable number.

51969629 is a deficient number, since it is larger than the sum of its proper divisors (3057055).

51969629 is a wasteful number, since it uses less digits than its factorization.

51969629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057054.

The product of its digits is 262440, while the sum is 47.

The square root of 51969629 is about 7208.9963933962. The cubic root of 51969629 is about 373.1784348015.

The spelling of 51969629 in words is "fifty-one million, nine hundred sixty-nine thousand, six hundred twenty-nine".