51432401 has 4 divisors (see below), whose sum is σ = 51452772. Its totient is φ = 51412032.

The previous prime is 51432391. The next prime is 51432431. The reversal of 51432401 is 10423415.

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 45576001 + 5856400 = 6751^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 51432401 - 2¹⁰ = 51431377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51432431) 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, 5756 + ... + 11661.

It is an arithmetic number, because the mean of its divisors is an integer number (12863193).

Almost surely, 2^51432401 is an apocalyptic number.

It is an amenable number.

51432401 is a deficient number, since it is larger than the sum of its proper divisors (20371).

51432401 is a wasteful number, since it uses less digits than its factorization.

51432401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51432401 is about 7171.6386551471. The cubic root of 51432401 is about 371.8880868308. Note that the first 3 decimals are identical.

Adding to 51432401 its reverse (10423415), we get a palindrome (61855816).

The spelling of 51432401 in words is "fifty-one million, four hundred thirty-two thousand, four hundred one".