51402401 has 6 divisors (see below), whose sum is σ = 53735010. Its totient is φ = 49167008.

The previous prime is 51402389. The next prime is 51402409. The reversal of 51402401 is 10420415.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 9928801 = 6440^2 + 3151^2 .

It is not a de Polignac number, because 51402401 - 2¹⁰ = 51401377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51402401.

It is not an unprimeable number, because it can be changed into a prime (51402409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48056 + ... + 49113.

It is an arithmetic number, because the mean of its divisors is an integer number (8955835).

Almost surely, 2^51402401 is an apocalyptic number.

It is an amenable number.

51402401 is a deficient number, since it is larger than the sum of its proper divisors (2332609).

51402401 is an equidigital number, since it uses as much as digits as its factorization.

51402401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97215 (or 97192 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51402401 is about 7169.5467778654. The cubic root of 51402401 is about 371.8157665796.

Adding to 51402401 its reverse (10420415), we get a palindrome (61822816).

The spelling of 51402401 in words is "fifty-one million, four hundred two thousand, four hundred one".