51641399 has 4 divisors (see below), whose sum is σ = 51665136. Its totient is φ = 51617664.

The previous prime is 51641347. The next prime is 51641437. The reversal of 51641399 is 99314615.

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 51641399 - 2⁸ = 51641143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51641299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8234 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (12916284).

Almost surely, 2^51641399 is an apocalyptic number.

51641399 is a deficient number, since it is larger than the sum of its proper divisors (23737).

51641399 is a wasteful number, since it uses less digits than its factorization.

51641399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23736.

The product of its digits is 29160, while the sum is 38.

The square root of 51641399 is about 7186.1950293601. The cubic root of 51641399 is about 372.3911343501.

The spelling of 51641399 in words is "fifty-one million, six hundred forty-one thousand, three hundred ninety-nine".