161489507 has 2 divisors, whose sum is σ = 161489508. Its totient is φ = 161489506.

The previous prime is 161489491. The next prime is 161489513. The reversal of 161489507 is 705984161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161489507 - 2⁴ = 161489491 is a prime.

It is a super-2 number, since 2×161489507² = 52157721742206098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161489407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80744753 + 80744754.

It is an arithmetic number, because the mean of its divisors is an integer number (80744754).

Almost surely, 2^161489507 is an apocalyptic number.

161489507 is a deficient number, since it is larger than the sum of its proper divisors (1).

161489507 is an equidigital number, since it uses as much as digits as its factorization.

161489507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 161489507 is about 12707.8521788696. The cubic root of 161489507 is about 544.5629658563.

The spelling of 161489507 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, five hundred seven".