161429731 has 2 divisors, whose sum is σ = 161429732. Its totient is φ = 161429730.

The previous prime is 161429717. The next prime is 161429743. The reversal of 161429731 is 137924161.

It is a strong prime.

It is an emirp because it is prime and its reverse (137924161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161429731 - 2¹¹ = 161427683 is a prime.

It is a super-2 number, since 2×161429731² = 52119116101464722, which contains 22 as substring.

It is the 12706-th Hogben number.

It is not a weakly prime, because it can be changed into another prime (161421731) by changing a digit.

It is a nontrivial repunit in base 12705.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80714865 + 80714866.

It is an arithmetic number, because the mean of its divisors is an integer number (80714866).

Almost surely, 2^161429731 is an apocalyptic number.

161429731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161429731 is an equidigital number, since it uses as much as digits as its factorization.

161429731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 161429731 is about 12705.5000295148. The cubic root of 161429731 is about 544.4957668296.

The spelling of 161429731 in words is "one hundred sixty-one million, four hundred twenty-nine thousand, seven hundred thirty-one".