25115401331 has 4 divisors (see below), whose sum is σ = 25135070112. Its totient is φ = 25095732552.

The previous prime is 25115401319. The next prime is 25115401349. The reversal of 25115401331 is 13310451152.

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 25115401331 - 2³⁴ = 7935532147 is a prime.

It is a super-2 number, since 2×25115401331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25115401331.

It is not an unprimeable number, because it can be changed into a prime (25115401361) 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, 9832475 + ... + 9835028.

It is an arithmetic number, because the mean of its divisors is an integer number (6283767528).

Almost surely, 2^25115401331 is an apocalyptic number.

25115401331 is a deficient number, since it is larger than the sum of its proper divisors (19668781).

25115401331 is a wasteful number, since it uses less digits than its factorization.

25115401331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19668780.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 25115401331 its reverse (13310451152), we get a palindrome (38425852483).

The spelling of 25115401331 in words is "twenty-five billion, one hundred fifteen million, four hundred one thousand, three hundred thirty-one".