25553381 has 4 divisors (see below), whose sum is σ = 29203872. Its totient is φ = 21902892.

The previous prime is 25553371. The next prime is 25553387. The reversal of 25553381 is 18335552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25553381 - 2¹⁴ = 25536997 is a prime.

It is a super-2 number, since 2×25553381² = 1305950561062322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25553387) 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, 1825235 + ... + 1825248.

It is an arithmetic number, because the mean of its divisors is an integer number (7300968).

Almost surely, 2^25553381 is an apocalyptic number.

It is an amenable number.

25553381 is a deficient number, since it is larger than the sum of its proper divisors (3650491).

25553381 is an equidigital number, since it uses as much as digits as its factorization.

25553381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650490.

The product of its digits is 18000, while the sum is 32.

The square root of 25553381 is about 5055.0352125381. The cubic root of 25553381 is about 294.5435092424.

The spelling of 25553381 in words is "twenty-five million, five hundred fifty-three thousand, three hundred eighty-one".