102940091 has 4 divisors (see below), whose sum is σ = 102960384. Its totient is φ = 102919800.

The previous prime is 102940087. The next prime is 102940093. The reversal of 102940091 is 190049201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190049201 = 1213 ⋅156677.

It is a cyclic number.

It is not a de Polignac number, because 102940091 - 2² = 102940087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102940091.

It is not an unprimeable number, because it can be changed into a prime (102940093) 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, 5021 + ... + 15201.

It is an arithmetic number, because the mean of its divisors is an integer number (25740096).

Almost surely, 2^102940091 is an apocalyptic number.

102940091 is a deficient number, since it is larger than the sum of its proper divisors (20293).

102940091 is a wasteful number, since it uses less digits than its factorization.

102940091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20292.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 102940091 is about 10145.9396312022. The cubic root of 102940091 is about 468.6639148345.

Adding to 102940091 its reverse (190049201), we get a palindrome (292989292).

The spelling of 102940091 in words is "one hundred two million, nine hundred forty thousand, ninety-one".