100091531 has 2 divisors, whose sum is σ = 100091532. Its totient is φ = 100091530.

The previous prime is 100091513. The next prime is 100091567. The reversal of 100091531 is 135190001.

Together with previous prime (100091513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100091531 is a prime.

It is a super-2 number, since 2×100091531² = 20036629155847922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100091581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50045765 + 50045766.

It is an arithmetic number, because the mean of its divisors is an integer number (50045766).

Almost surely, 2^100091531 is an apocalyptic number.

100091531 is a deficient number, since it is larger than the sum of its proper divisors (1).

100091531 is an equidigital number, since it uses as much as digits as its factorization.

100091531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 100091531 is about 10004.5755032385. The cubic root of 100091531 is about 464.3004565981.

The spelling of 100091531 in words is "one hundred million, ninety-one thousand, five hundred thirty-one".