101955990 has 32 divisors (see below), whose sum is σ = 246571776. Its totient is φ = 26979680.

The previous prime is 101955989. The next prime is 101956051. The reversal of 101955990 is 99559101.

It is a congruent 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, 9042 + ... + 16901.

It is an arithmetic number, because the mean of its divisors is an integer number (7705368).

Almost surely, 2^101955990 is an apocalyptic number.

101955990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101955990 is an abundant number, since it is smaller than the sum of its proper divisors (144615786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101955990 is a wasteful number, since it uses less digits than its factorization.

101955990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26084.

The product of its (nonzero) digits is 18225, while the sum is 39.

The square root of 101955990 is about 10097.3258836189. The cubic root of 101955990 is about 467.1656640876.

The spelling of 101955990 in words is "one hundred one million, nine hundred fifty-five thousand, nine hundred ninety".