51533401 has 4 divisors (see below), whose sum is σ = 52239412. Its totient is φ = 50827392.

The previous prime is 51533389. The next prime is 51533429. The reversal of 51533401 is 10433515.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 12145225 = 6276^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 51533401 - 2⁵ = 51533369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51533441) 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, 352896 + ... + 353041.

It is an arithmetic number, because the mean of its divisors is an integer number (13059853).

Almost surely, 2^51533401 is an apocalyptic number.

It is an amenable number.

51533401 is a deficient number, since it is larger than the sum of its proper divisors (706011).

51533401 is an equidigital number, since it uses as much as digits as its factorization.

51533401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706010.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 51533401 is about 7178.6768279398. The cubic root of 51533401 is about 372.1313584930.

Adding to 51533401 its reverse (10433515), we get a palindrome (61966916).

The spelling of 51533401 in words is "fifty-one million, five hundred thirty-three thousand, four hundred one".