161107431 has 4 divisors (see below), whose sum is σ = 214809912. Its totient is φ = 107404952.

The previous prime is 161107417. The next prime is 161107447. The reversal of 161107431 is 134701161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161107431 - 2¹¹ = 161105383 is a prime.

It is a super-2 number, since 2×161107431² = 51911208646839522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161107931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26851236 + ... + 26851241.

It is an arithmetic number, because the mean of its divisors is an integer number (53702478).

Almost surely, 2^161107431 is an apocalyptic number.

161107431 is a deficient number, since it is larger than the sum of its proper divisors (53702481).

161107431 is an equidigital number, since it uses as much as digits as its factorization.

161107431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53702480.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 161107431 is about 12692.8102089332. The cubic root of 161107431 is about 544.1331572377.

Adding to 161107431 its reverse (134701161), we get a palindrome (295808592).

The spelling of 161107431 in words is "one hundred sixty-one million, one hundred seven thousand, four hundred thirty-one".