101137991 has 2 divisors, whose sum is σ = 101137992. Its totient is φ = 101137990.

The previous prime is 101137979. The next prime is 101137999. The reversal of 101137991 is 199731101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101137991 - 2¹⁸ = 100875847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101137999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50568995 + 50568996.

It is an arithmetic number, because the mean of its divisors is an integer number (50568996).

Almost surely, 2^101137991 is an apocalyptic number.

101137991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101137991 is an equidigital number, since it uses as much as digits as its factorization.

101137991 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 101137991 is about 10056.7385866393. The cubic root of 101137991 is about 465.9129418560.

The spelling of 101137991 in words is "one hundred one million, one hundred thirty-seven thousand, nine hundred ninety-one".