161475631 has 2 divisors, whose sum is σ = 161475632. Its totient is φ = 161475630.

The previous prime is 161475619. The next prime is 161475641. The reversal of 161475631 is 136574161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161475631 - 2¹¹ = 161473583 is a prime.

It is a super-2 number, since 2×161475631² = 52148758813696322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161475641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80737815 + 80737816.

It is an arithmetic number, because the mean of its divisors is an integer number (80737816).

Almost surely, 2^161475631 is an apocalyptic number.

161475631 is a deficient number, since it is larger than the sum of its proper divisors (1).

161475631 is an equidigital number, since it uses as much as digits as its factorization.

161475631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 161475631 is about 12707.3062054867. The cubic root of 161475631 is about 544.5473682027.

The spelling of 161475631 in words is "one hundred sixty-one million, four hundred seventy-five thousand, six hundred thirty-one".