51135642 has 24 divisors (see below), whose sum is σ = 114615540. Its totient is φ = 16457280.

The previous prime is 51135641. The next prime is 51135653. The reversal of 51135642 is 24653115.

51135642 is a `hidden beast` number, since 5 + 1 + 13 + 5 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 50253921 + 881721 = 7089^2 + 939^2 .

It is a super-2 number, since 2×51135642² = 5229707765504328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51135641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48459 + ... + 49502.

Almost surely, 2^51135642 is an apocalyptic number.

51135642 is an abundant number, since it is smaller than the sum of its proper divisors (63479898).

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

51135642 is a wasteful number, since it uses less digits than its factorization.

51135642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97998 (or 97995 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51135642 is about 7150.9189619237. The cubic root of 51135642 is about 371.1714563630.

Adding to 51135642 its reverse (24653115), we get a palindrome (75788757).

The spelling of 51135642 in words is "fifty-one million, one hundred thirty-five thousand, six hundred forty-two".