161610511 has 2 divisors, whose sum is σ = 161610512. Its totient is φ = 161610510.

The previous prime is 161610509. The next prime is 161610557. The reversal of 161610511 is 115016161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161610511 - 2¹ = 161610509 is a prime.

It is a super-2 number, since 2×161610511² = 52235914531362242, which contains 22 as substring.

Together with 161610509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161610571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805255 + 80805256.

It is an arithmetic number, because the mean of its divisors is an integer number (80805256).

Almost surely, 2^161610511 is an apocalyptic number.

161610511 is a deficient number, since it is larger than the sum of its proper divisors (1).

161610511 is an equidigital number, since it uses as much as digits as its factorization.

161610511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 161610511 is about 12712.6122807234. The cubic root of 161610511 is about 544.6989454771.

Adding to 161610511 its reverse (115016161), we get a palindrome (276626672).

The spelling of 161610511 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred eleven".