25416981 has 6 divisors (see below), whose sum is σ = 36713430. Its totient is φ = 16944648.

The previous prime is 25416973. The next prime is 25416983. The reversal of 25416981 is 18961452.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 7650756 = 4215^2 + 2766^2 .

It is not a de Polignac number, because 25416981 - 2³ = 25416973 is a prime.

It is a super-2 number, since 2×25416981² = 1292045846308722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25416983) 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, 1412046 + ... + 1412063.

It is an arithmetic number, because the mean of its divisors is an integer number (6118905).

Almost surely, 2^25416981 is an apocalyptic number.

It is an amenable number.

25416981 is a deficient number, since it is larger than the sum of its proper divisors (11296449).

25416981 is a wasteful number, since it uses less digits than its factorization.

25416981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824115 (or 2824112 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 25416981 is about 5041.5256619400. The cubic root of 25416981 is about 294.0184980725.

The spelling of 25416981 in words is "twenty-five million, four hundred sixteen thousand, nine hundred eighty-one".