16102991 has 2 divisors, whose sum is σ = 16102992. Its totient is φ = 16102990.

The previous prime is 16102979. The next prime is 16102993. The reversal of 16102991 is 19920161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16102991 is a prime.

It is a Sophie Germain prime.

Together with 16102993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16102993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8051495 + 8051496.

It is an arithmetic number, because the mean of its divisors is an integer number (8051496).

Almost surely, 2^16102991 is an apocalyptic number.

16102991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16102991 is an equidigital number, since it uses as much as digits as its factorization.

16102991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 16102991 is about 4012.8532243280. The cubic root of 16102991 is about 252.5237228961.

The spelling of 16102991 in words is "sixteen million, one hundred two thousand, nine hundred ninety-one".