25071872281 has 3 divisors (see below), whose sum is σ = 25072030623. Its totient is φ = 25071713940.

The previous prime is 25071872249. The next prime is 25071872299. The reversal of 25071872281 is 18227817052.

The square root of 25071872281 is 158341.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 21274847881 + 3797024400 = 145859^2 + 61620^2 .

It is not a de Polignac number, because 25071872281 - 2⁵ = 25071872249 is a prime.

It is a super-2 number, since 2×25071872281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25071872381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 79171 + ... + 237511.

It is an arithmetic number, because the mean of its divisors is an integer number (8357343541).

Almost surely, 2^25071872281 is an apocalyptic number.

25071872281 is the 158341-st square number.

25071872281 is the 79171-st centered octagonal number.

It is an amenable number.

25071872281 is a deficient number, since it is larger than the sum of its proper divisors (158342).

25071872281 is an frugal number, since it uses more digits than its factorization.

25071872281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316682 (or 158341 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 25071872281 in words is "twenty-five billion, seventy-one million, eight hundred seventy-two thousand, two hundred eighty-one".