161611447 has 2 divisors, whose sum is σ = 161611448. Its totient is φ = 161611446.

The previous prime is 161611423. The next prime is 161611459. The reversal of 161611447 is 744116161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161611447 - 2⁷ = 161611319 is a prime.

It is a super-2 number, since 2×161611447² = 52236519602867618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161611477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805723 + 80805724.

It is an arithmetic number, because the mean of its divisors is an integer number (80805724).

Almost surely, 2^161611447 is an apocalyptic number.

161611447 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611447 is an equidigital number, since it uses as much as digits as its factorization.

161611447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 161611447 is about 12712.6490945043. The cubic root of 161611447 is about 544.6999970531.

It can be divided in two parts, 1616114 and 47, that added together give a palindrome (1616161).

The spelling of 161611447 in words is "one hundred sixty-one million, six hundred eleven thousand, four hundred forty-seven".