101640139 has 8 divisors (see below), whose sum is σ = 108587840. Its totient is φ = 94852296.

The previous prime is 101640137. The next prime is 101640193. The reversal of 101640139 is 931046101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 101640139 - 2¹ = 101640137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101640131) 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, 38649 + ... + 41194.

It is an arithmetic number, because the mean of its divisors is an integer number (13573480).

Almost surely, 2^101640139 is an apocalyptic number.

101640139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

101640139 is a deficient number, since it is larger than the sum of its proper divisors (6947701).

101640139 is an equidigital number, since it uses as much as digits as its factorization.

101640139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79929.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 101640139 is about 10081.6734226020. The cubic root of 101640139 is about 466.6827518832.

The spelling of 101640139 in words is "one hundred one million, six hundred forty thousand, one hundred thirty-nine".