51613236 has 54 divisors (see below), whose sum is σ = 132678182. Its totient is φ = 16917120.

The previous prime is 51613231. The next prime is 51613267. The reversal of 51613236 is 63231615.

It can be written as a sum of positive squares in 3 ways, for example, as 3920400 + 47692836 = 1980^2 + 6906^2 .

It is a super-2 number, since 2×51613236² = 5327852260783392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 285066 + ... + 285246.

Almost surely, 2^51613236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51613236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66339091).

51613236 is an abundant number, since it is smaller than the sum of its proper divisors (81064946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51613236 is a wasteful number, since it uses less digits than its factorization.

51613236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 275 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 51613236 is about 7184.2352411374. The cubic root of 51613236 is about 372.3234266659.

The spelling of 51613236 in words is "fifty-one million, six hundred thirteen thousand, two hundred thirty-six".