25073981 has 4 divisors (see below), whose sum is σ = 25204092. Its totient is φ = 24943872.

The previous prime is 25073959. The next prime is 25074017. The reversal of 25073981 is 18937052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11868025 + 13205956 = 3445^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 25073981 - 2¹⁴ = 25057597 is a prime.

It is a super-2 number, since 2×25073981² = 1257409046376722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25073921) 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, 64766 + ... + 65151.

It is an arithmetic number, because the mean of its divisors is an integer number (6301023).

Almost surely, 2^25073981 is an apocalyptic number.

It is an amenable number.

25073981 is a deficient number, since it is larger than the sum of its proper divisors (130111).

25073981 is a wasteful number, since it uses less digits than its factorization.

25073981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130110.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 25073981 is about 5007.3926348949. The cubic root of 25073981 is about 292.6899187863.

The spelling of 25073981 in words is "twenty-five million, seventy-three thousand, nine hundred eighty-one".