101971139 has 2 divisors, whose sum is σ = 101971140. Its totient is φ = 101971138.

The previous prime is 101971097. The next prime is 101971147. The reversal of 101971139 is 931179101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101971139 - 2¹² = 101967043 is a prime.

It is a super-2 number, since 2×101971139² = 20796226377914642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101971159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50985569 + 50985570.

It is an arithmetic number, because the mean of its divisors is an integer number (50985570).

Almost surely, 2^101971139 is an apocalyptic number.

101971139 is a deficient number, since it is larger than the sum of its proper divisors (1).

101971139 is an equidigital number, since it uses as much as digits as its factorization.

101971139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701, while the sum is 32.

The square root of 101971139 is about 10098.0760048635. The cubic root of 101971139 is about 467.1888006787.

The spelling of 101971139 in words is "one hundred one million, nine hundred seventy-one thousand, one hundred thirty-nine".