16891031 has 2 divisors, whose sum is σ = 16891032. Its totient is φ = 16891030.

The previous prime is 16891003. The next prime is 16891033. The reversal of 16891031 is 13019861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16891031 is a prime.

It is a super-2 number, since 2×16891031² = 570613856485922, which contains 22 as substring.

Together with 16891033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16890985 and 16891003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16891033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445515 + 8445516.

It is an arithmetic number, because the mean of its divisors is an integer number (8445516).

Almost surely, 2^16891031 is an apocalyptic number.

16891031 is a deficient number, since it is larger than the sum of its proper divisors (1).

16891031 is an equidigital number, since it uses as much as digits as its factorization.

16891031 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 29.

The square root of 16891031 is about 4109.8699492806. The cubic root of 16891031 is about 256.5775888858.

The spelling of 16891031 in words is "sixteen million, eight hundred ninety-one thousand, thirty-one".