101251990 has 16 divisors (see below), whose sum is σ = 208289952. Its totient is φ = 34714944.

The previous prime is 101251973. The next prime is 101251999. The reversal of 101251990 is 99152101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101251999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723159 + ... + 723298.

It is an arithmetic number, because the mean of its divisors is an integer number (13018122).

Almost surely, 2^101251990 is an apocalyptic number.

101251990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101251990 is an abundant number, since it is smaller than the sum of its proper divisors (107037962).

101251990 is a wasteful number, since it uses less digits than its factorization.

101251990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446471.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 101251990 is about 10062.4047821582. The cubic root of 101251990 is about 466.0879294003.

The spelling of 101251990 in words is "one hundred one million, two hundred fifty-one thousand, nine hundred ninety".