101239947 has 24 divisors (see below), whose sum is σ = 158623920. Its totient is φ = 61969920.

The previous prime is 101239939. The next prime is 101239949. The reversal of 101239947 is 749932101.

It is not a de Polignac number, because 101239947 - 2³ = 101239939 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (101239949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1797 + ... + 14342.

It is an arithmetic number, because the mean of its divisors is an integer number (6609330).

Almost surely, 2^101239947 is an apocalyptic number.

101239947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

101239947 is a deficient number, since it is larger than the sum of its proper divisors (57383973).

101239947 is a wasteful number, since it uses less digits than its factorization.

101239947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16203 (or 16200 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 101239947 is about 10061.8063487626. The cubic root of 101239947 is about 466.0694496994.

The spelling of 101239947 in words is "one hundred one million, two hundred thirty-nine thousand, nine hundred forty-seven".