101229991 has 2 divisors, whose sum is σ = 101229992. Its totient is φ = 101229990.

The previous prime is 101229979. The next prime is 101230001. The reversal of 101229991 is 199922101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101229991 - 2¹¹ = 101227943 is a prime.

It is a super-2 number, since 2×101229991² = 20495022155720162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101229971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50614995 + 50614996.

It is an arithmetic number, because the mean of its divisors is an integer number (50614996).

Almost surely, 2^101229991 is an apocalyptic number.

101229991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101229991 is an equidigital number, since it uses as much as digits as its factorization.

101229991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 101229991 is about 10061.3115944195. The cubic root of 101229991 is about 466.0541713444.

The spelling of 101229991 in words is "one hundred one million, two hundred twenty-nine thousand, nine hundred ninety-one".