101291891 has 2 divisors, whose sum is σ = 101291892. Its totient is φ = 101291890.

The previous prime is 101291881. The next prime is 101291893. The reversal of 101291891 is 198192101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101291891 - 2¹⁴ = 101275507 is a prime.

It is a Sophie Germain prime.

Together with 101291893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101291893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50645945 + 50645946.

It is an arithmetic number, because the mean of its divisors is an integer number (50645946).

Almost surely, 2^101291891 is an apocalyptic number.

101291891 is a deficient number, since it is larger than the sum of its proper divisors (1).

101291891 is an equidigital number, since it uses as much as digits as its factorization.

101291891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 101291891 is about 10064.3872640117. The cubic root of 101291891 is about 466.1491460805.

The spelling of 101291891 in words is "one hundred one million, two hundred ninety-one thousand, eight hundred ninety-one".