102191690 has 32 divisors (see below), whose sum is σ = 194166720. Its totient is φ = 38617344.

The previous prime is 102191657. The next prime is 102191701. The reversal of 102191690 is 96191201.

It is a super-2 number, since 2×102191690² = 20886283010112200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112217 + ... + 113123.

It is an arithmetic number, because the mean of its divisors is an integer number (6067710).

Almost surely, 2^102191690 is an apocalyptic number.

102191690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102191690 is a deficient number, since it is larger than the sum of its proper divisors (91975030).

102191690 is a wasteful number, since it uses less digits than its factorization.

102191690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 102191690 is about 10108.9905529682. The cubic root of 102191690 is about 467.5253820568.

The spelling of 102191690 in words is "one hundred two million, one hundred ninety-one thousand, six hundred ninety".