51135138 has 40 divisors (see below), whose sum is σ = 115991568. Its totient is φ = 16835256.

The previous prime is 51135103. The next prime is 51135169. The reversal of 51135138 is 83153115.

It is a super-2 number, since 2×51135138² = 5229604676558088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11545 + ... + 15347.

Almost surely, 2^51135138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51135138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57995784).

51135138 is an abundant number, since it is smaller than the sum of its proper divisors (64856430).

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

51135138 is a wasteful number, since it uses less digits than its factorization.

51135138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900 (or 3891 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51135138 is about 7150.8837216109. The cubic root of 51135138 is about 371.1702369198.

The spelling of 51135138 in words is "fifty-one million, one hundred thirty-five thousand, one hundred thirty-eight".