51533155 has 8 divisors (see below), whose sum is σ = 61878672. Its totient is φ = 41200608.

The previous prime is 51533143. The next prime is 51533161. The reversal of 51533155 is 55133515.

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

It is a cyclic number.

It is not a de Polignac number, because 51533155 - 2⁹ = 51532643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12177 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (7734834).

Almost surely, 2^51533155 is an apocalyptic number.

51533155 is a deficient number, since it is larger than the sum of its proper divisors (10345517).

51533155 is a wasteful number, since it uses less digits than its factorization.

51533155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6485.

The product of its digits is 5625, while the sum is 28.

The square root of 51533155 is about 7178.6596938426. The cubic root of 51533155 is about 372.1307663563.

It can be divided in two parts, 515 and 33155, that added together give a triangular number (33670 = T₂₅₉).

The spelling of 51533155 in words is "fifty-one million, five hundred thirty-three thousand, one hundred fifty-five".