101601990 has 72 divisors (see below), whose sum is σ = 307307520. Its totient is φ = 23222304.

The previous prime is 101601989. The next prime is 101602003. The reversal of 101601990 is 99106101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7110 + ... + 15929.

It is an arithmetic number, because the mean of its divisors is an integer number (4268160).

Almost surely, 2^101601990 is an apocalyptic number.

101601990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101601990 is an abundant number, since it is smaller than the sum of its proper divisors (205705530).

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

101601990 is a wasteful number, since it uses less digits than its factorization.

101601990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23066 (or 23056 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 101601990 is about 10079.7812476264. The cubic root of 101601990 is about 466.6243572753.

The spelling of 101601990 in words is "one hundred one million, six hundred one thousand, nine hundred ninety".