51133551 has 8 divisors (see below), whose sum is σ = 77917824. Its totient is φ = 29219160.

The previous prime is 51133547. The next prime is 51133553. The reversal of 51133551 is 15533115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51133551 - 2² = 51133547 is a prime.

It is a super-2 number, since 2×51133551² = 5229280075739202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51133553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217445 + ... + 1217486.

It is an arithmetic number, because the mean of its divisors is an integer number (9739728).

Almost surely, 2^51133551 is an apocalyptic number.

51133551 is a deficient number, since it is larger than the sum of its proper divisors (26784273).

51133551 is a wasteful number, since it uses less digits than its factorization.

51133551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434941.

The product of its digits is 1125, while the sum is 24.

The square root of 51133551 is about 7150.7727554440. The cubic root of 51133551 is about 371.1663970732.

Adding to 51133551 its reverse (15533115), we get a palindrome (66666666).

The spelling of 51133551 in words is "fifty-one million, one hundred thirty-three thousand, five hundred fifty-one".