161616031 has 2 divisors, whose sum is σ = 161616032. Its totient is φ = 161616030.

The previous prime is 161616029. The next prime is 161616097. The reversal of 161616031 is 130616161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161616031 - 2¹ = 161616029 is a prime.

It is a super-2 number, since 2×161616031² = 52239482952385922, which contains 22 as substring.

Together with 161616029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161615987 and 161616005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161616001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80808015 + 80808016.

It is an arithmetic number, because the mean of its divisors is an integer number (80808016).

Almost surely, 2^161616031 is an apocalyptic number.

161616031 is a deficient number, since it is larger than the sum of its proper divisors (1).

161616031 is an equidigital number, since it uses as much as digits as its factorization.

161616031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 161616031 is about 12712.8293860966. The cubic root of 161616031 is about 544.7051470208.

The spelling of 161616031 in words is "one hundred sixty-one million, six hundred sixteen thousand, thirty-one".