25535981 has 8 divisors (see below), whose sum is σ = 26964000. Its totient is φ = 24116400.

The previous prime is 25535963. The next prime is 25535999. The reversal of 25535981 is 18953552.

It is an interprime number because it is at equal distance from previous prime (25535963) and next prime (25535999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25535981 is a prime.

It is a super-2 number, since 2×25535981² = 1304172651264722, 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 (25535941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4706 + ... + 8556.

It is an arithmetic number, because the mean of its divisors is an integer number (3370500).

Almost surely, 2^25535981 is an apocalyptic number.

It is an amenable number.

25535981 is a deficient number, since it is larger than the sum of its proper divisors (1428019).

25535981 is a wasteful number, since it uses less digits than its factorization.

25535981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219.

The product of its digits is 54000, while the sum is 38.

The square root of 25535981 is about 5053.3138631991. The cubic root of 25535981 is about 294.4766398033.

The spelling of 25535981 in words is "twenty-five million, five hundred thirty-five thousand, nine hundred eighty-one".