161040431 has 2 divisors, whose sum is σ = 161040432. Its totient is φ = 161040430.

The previous prime is 161040419. The next prime is 161040449. The reversal of 161040431 is 134040161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161040431 - 2¹⁴ = 161024047 is a prime.

It is a super-2 number, since 2×161040431² = 51868040833331522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161040401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80520215 + 80520216.

It is an arithmetic number, because the mean of its divisors is an integer number (80520216).

Almost surely, 2^161040431 is an apocalyptic number.

161040431 is a deficient number, since it is larger than the sum of its proper divisors (1).

161040431 is an equidigital number, since it uses as much as digits as its factorization.

161040431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 161040431 is about 12690.1706450307. The cubic root of 161040431 is about 544.0577169424.

Adding to 161040431 its reverse (134040161), we get a palindrome (295080592).

The spelling of 161040431 in words is "one hundred sixty-one million, forty thousand, four hundred thirty-one".