161285507 has 2 divisors, whose sum is σ = 161285508. Its totient is φ = 161285506.

The previous prime is 161285503. The next prime is 161285563. The reversal of 161285507 is 705582161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161285507 - 2² = 161285503 is a prime.

It is not a weakly prime, because it can be changed into another prime (161285503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80642753 + 80642754.

It is an arithmetic number, because the mean of its divisors is an integer number (80642754).

Almost surely, 2^161285507 is an apocalyptic number.

161285507 is a deficient number, since it is larger than the sum of its proper divisors (1).

161285507 is an equidigital number, since it uses as much as digits as its factorization.

161285507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 161285507 is about 12699.8231090043. The cubic root of 161285507 is about 544.3335646646. Note that the first 3 decimals are identical.

The spelling of 161285507 in words is "one hundred sixty-one million, two hundred eighty-five thousand, five hundred seven".