102969991 has 2 divisors, whose sum is σ = 102969992. Its totient is φ = 102969990.

The previous prime is 102969917. The next prime is 102970067. The reversal of 102969991 is 199969201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102969991 - 2⁹ = 102969479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102969791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51484995 + 51484996.

It is an arithmetic number, because the mean of its divisors is an integer number (51484996).

Almost surely, 2^102969991 is an apocalyptic number.

102969991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102969991 is an equidigital number, since it uses as much as digits as its factorization.

102969991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 46.

The square root of 102969991 is about 10147.4130200756. The cubic root of 102969991 is about 468.7092865143.

The spelling of 102969991 in words is "one hundred two million, nine hundred sixty-nine thousand, nine hundred ninety-one".