101606391 has 12 divisors (see below), whose sum is σ = 146852160. Its totient is φ = 67697280.

The previous prime is 101606389. The next prime is 101606413. The reversal of 101606391 is 193606101.

101606391 is a `hidden beast` number, since 10 + 16 + 0 + 639 + 1 = 666.

It is not a de Polignac number, because 101606391 - 2¹ = 101606389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101606321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28551 + ... + 31911.

It is an arithmetic number, because the mean of its divisors is an integer number (12237680).

Almost surely, 2^101606391 is an apocalyptic number.

101606391 is a deficient number, since it is larger than the sum of its proper divisors (45245769).

101606391 is a wasteful number, since it uses less digits than its factorization.

101606391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6726 (or 6723 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 101606391 is about 10079.9995535714. Note that the first 3 decimals coincide. The cubic root of 101606391 is about 466.6310946242.

The spelling of 101606391 in words is "one hundred one million, six hundred six thousand, three hundred ninety-one".