161542507 has 8 divisors (see below), whose sum is σ = 185435136. Its totient is φ = 137853672.

The previous prime is 161542489. The next prime is 161542543. The reversal of 161542507 is 705245161.

161542507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161542507 - 2²³ = 153153899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161042507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49243 + ... + 52420.

It is an arithmetic number, because the mean of its divisors is an integer number (23179392).

Almost surely, 2^161542507 is an apocalyptic number.

161542507 is a deficient number, since it is larger than the sum of its proper divisors (23892629).

161542507 is a wasteful number, since it uses less digits than its factorization.

161542507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101897.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 161542507 is about 12709.9373326543. The cubic root of 161542507 is about 544.6225335662.

Adding to 161542507 its reverse (705245161), we get a palindrome (866787668).

The spelling of 161542507 in words is "one hundred sixty-one million, five hundred forty-two thousand, five hundred seven".