100925981 has 4 divisors (see below), whose sum is σ = 108689532. Its totient is φ = 93162432.

The previous prime is 100925971. The next prime is 100925999. The reversal of 100925981 is 189529001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189529001 = 12377 ⋅15313.

It can be written as a sum of positive squares in 2 ways, for example, as 6175225 + 94750756 = 2485^2 + 9734^2 .

It is a cyclic number.

It is not a de Polignac number, because 100925981 - 2⁶ = 100925917 is a prime.

It is a super-2 number, since 2×100925981² = 20372107281624722, 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 (100925921) 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, 3881756 + ... + 3881781.

It is an arithmetic number, because the mean of its divisors is an integer number (27172383).

Almost surely, 2^100925981 is an apocalyptic number.

It is an amenable number.

100925981 is a deficient number, since it is larger than the sum of its proper divisors (7763551).

100925981 is an equidigital number, since it uses as much as digits as its factorization.

100925981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763550.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 100925981 is about 10046.1923632787. The cubic root of 100925981 is about 465.5871582297.

The spelling of 100925981 in words is "one hundred million, nine hundred twenty-five thousand, nine hundred eighty-one".