101991513 has 16 divisors (see below), whose sum is σ = 146658176. Its totient is φ = 62674560.

The previous prime is 101991511. The next prime is 101991529. The reversal of 101991513 is 315199101.

It is not a de Polignac number, because 101991513 - 2¹ = 101991511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101991511) 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, 35148 + ... + 37938.

It is an arithmetic number, because the mean of its divisors is an integer number (9166136).

Almost surely, 2^101991513 is an apocalyptic number.

101991513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

101991513 is a deficient number, since it is larger than the sum of its proper divisors (44666663).

101991513 is a wasteful number, since it uses less digits than its factorization.

101991513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744.

The product of its (nonzero) digits is 1215, while the sum is 30.

The square root of 101991513 is about 10099.0847605117. The cubic root of 101991513 is about 467.2199136349.

The spelling of 101991513 in words is "one hundred one million, nine hundred ninety-one thousand, five hundred thirteen".