51213525 has 48 divisors (see below), whose sum is σ = 96422400. Its totient is φ = 23742400.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213525 is 52531215.

It is a happy number.

It is not a de Polignac number, because 51213525 - 2¹ = 51213523 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51213495 and 51213504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17626 + ... + 20324.

It is an arithmetic number, because the mean of its divisors is an integer number (2008800).

Almost surely, 2^51213525 is an apocalyptic number.

51213525 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51213525 is a deficient number, since it is larger than the sum of its proper divisors (45208875).

51213525 is a wasteful number, since it uses less digits than its factorization.

51213525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2741 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 51213525 is about 7156.3625537000. The cubic root of 51213525 is about 371.3598004192.

It can be divided in two parts, 5121 and 3525, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 51213525 in words is "fifty-one million, two hundred thirteen thousand, five hundred twenty-five".