102001091 has 4 divisors (see below), whose sum is σ = 105518400. Its totient is φ = 98483784.

The previous prime is 102001073. The next prime is 102001099. The reversal of 102001091 is 190100201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190100201 = 557 ⋅341293.

It is a cyclic number.

It is not a de Polignac number, because 102001091 - 2⁶ = 102001027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102001099) 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, 1758611 + ... + 1758668.

It is an arithmetic number, because the mean of its divisors is an integer number (26379600).

Almost surely, 2^102001091 is an apocalyptic number.

102001091 is a deficient number, since it is larger than the sum of its proper divisors (3517309).

102001091 is an equidigital number, since it uses as much as digits as its factorization.

102001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517308.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 102001091 is about 10099.5589507661. The cubic root of 102001091 is about 467.2345386827.

Adding to 102001091 its reverse (190100201), we get a palindrome (292101292).

The spelling of 102001091 in words is "one hundred two million, one thousand, ninety-one".