100155691 has 4 divisors (see below), whose sum is σ = 100715400. Its totient is φ = 99595984.

The previous prime is 100155689. The next prime is 100155703. The reversal of 100155691 is 196551001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100155691 - 2¹ = 100155689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100155611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279586 + ... + 279943.

It is an arithmetic number, because the mean of its divisors is an integer number (25178850).

Almost surely, 2^100155691 is an apocalyptic number.

100155691 is a deficient number, since it is larger than the sum of its proper divisors (559709).

100155691 is an equidigital number, since it uses as much as digits as its factorization.

100155691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559708.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 100155691 is about 10007.7815223955. The cubic root of 100155691 is about 464.3996429931.

The spelling of 100155691 in words is "one hundred million, one hundred fifty-five thousand, six hundred ninety-one".