161269231 has 2 divisors, whose sum is σ = 161269232. Its totient is φ = 161269230.

The previous prime is 161269219. The next prime is 161269237. The reversal of 161269231 is 132962161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161269231 - 2⁹ = 161268719 is a prime.

It is a super-2 number, since 2×161269231² = 52015529734662722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161269193 and 161269202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161269237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80634615 + 80634616.

It is an arithmetic number, because the mean of its divisors is an integer number (80634616).

Almost surely, 2^161269231 is an apocalyptic number.

161269231 is a deficient number, since it is larger than the sum of its proper divisors (1).

161269231 is an equidigital number, since it uses as much as digits as its factorization.

161269231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 161269231 is about 12699.1822965103. The cubic root of 161269231 is about 544.3152537176.

The spelling of 161269231 in words is "one hundred sixty-one million, two hundred sixty-nine thousand, two hundred thirty-one".