51026401 has 4 divisors (see below), whose sum is σ = 54027972. Its totient is φ = 48024832.

The previous prime is 51026389. The next prime is 51026407. The reversal of 51026401 is 10462015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10462015 = 5 ⋅2092403.

It can be written as a sum of positive squares in 2 ways, for example, as 24245776 + 26780625 = 4924^2 + 5175^2 .

It is a cyclic number.

It is not a de Polignac number, because 51026401 - 2⁵ = 51026369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51026407) 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, 1500760 + ... + 1500793.

It is an arithmetic number, because the mean of its divisors is an integer number (13506993).

Almost surely, 2^51026401 is an apocalyptic number.

It is an amenable number.

51026401 is a deficient number, since it is larger than the sum of its proper divisors (3001571).

51026401 is a wasteful number, since it uses less digits than its factorization.

51026401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001570.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51026401 is about 7143.2766291108. The cubic root of 51026401 is about 370.9069569037.

Adding to 51026401 its reverse (10462015), we get a palindrome (61488416).

The spelling of 51026401 in words is "fifty-one million, twenty-six thousand, four hundred one".