100265381 has 4 divisors (see below), whose sum is σ = 100904172. Its totient is φ = 99626592.

The previous prime is 100265369. The next prime is 100265423. The reversal of 100265381 is 183562001.

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 61936900 + 38328481 = 7870^2 + 6191^2 .

It is a cyclic number.

It is not a de Polignac number, because 100265381 - 2¹⁰ = 100264357 is a prime.

It is a super-2 number, since 2×100265381² = 20106293254150322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 100265381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100265351) 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, 319160 + ... + 319473.

It is an arithmetic number, because the mean of its divisors is an integer number (25226043).

Almost surely, 2^100265381 is an apocalyptic number.

It is an amenable number.

100265381 is a deficient number, since it is larger than the sum of its proper divisors (638791).

100265381 is an equidigital number, since it uses as much as digits as its factorization.

100265381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638790.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 100265381 is about 10013.2602582775. The cubic root of 100265381 is about 464.5691171762.

The spelling of 100265381 in words is "one hundred million, two hundred sixty-five thousand, three hundred eighty-one".