109698991 has 2 divisors, whose sum is σ = 109698992. Its totient is φ = 109698990.

The previous prime is 109698961. The next prime is 109699003. The reversal of 109698991 is 199896901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109698991 - 2¹¹ = 109696943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109698961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54849495 + 54849496.

It is an arithmetic number, because the mean of its divisors is an integer number (54849496).

Almost surely, 2^109698991 is an apocalyptic number.

109698991 is a deficient number, since it is larger than the sum of its proper divisors (1).

109698991 is an equidigital number, since it uses as much as digits as its factorization.

109698991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 52.

The square root of 109698991 is about 10473.7286101942. The cubic root of 109698991 is about 478.7045378096.

The spelling of 109698991 in words is "one hundred nine million, six hundred ninety-eight thousand, nine hundred ninety-one".