102218991 has 16 divisors (see below), whose sum is σ = 155904000. Its totient is φ = 58357728.

The previous prime is 102218983. The next prime is 102219017. The reversal of 102218991 is 199812201.

It is not a de Polignac number, because 102218991 - 2³ = 102218983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102228991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41410 + ... + 43808.

It is an arithmetic number, because the mean of its divisors is an integer number (9744000).

Almost surely, 2^102218991 is an apocalyptic number.

102218991 is a deficient number, since it is larger than the sum of its proper divisors (53685009).

102218991 is a wasteful number, since it uses less digits than its factorization.

102218991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 102218991 is about 10110.3407954430. The cubic root of 102218991 is about 467.5670122323.

The spelling of 102218991 in words is "one hundred two million, two hundred eighteen thousand, nine hundred ninety-one".