51720335 has 4 divisors (see below), whose sum is σ = 62064408. Its totient is φ = 41376264.

The previous prime is 51720329. The next prime is 51720359. The reversal of 51720335 is 53302715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51720335 - 2¹² = 51716239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5172029 + ... + 5172038.

It is an arithmetic number, because the mean of its divisors is an integer number (15516102).

Almost surely, 2^51720335 is an apocalyptic number.

51720335 is a deficient number, since it is larger than the sum of its proper divisors (10344073).

51720335 is a wasteful number, since it uses less digits than its factorization.

51720335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344072.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 51720335 is about 7191.6851293699. The cubic root of 51720335 is about 372.5807761405.

The spelling of 51720335 in words is "fifty-one million, seven hundred twenty thousand, three hundred thirty-five".