161641539 has 12 divisors (see below), whose sum is σ = 243633936. Its totient is φ = 103075632.

The previous prime is 161641537. The next prime is 161641547. The reversal of 161641539 is 935146161.

161641539 is a `hidden beast` number, since 1 + 6 + 1 + 641 + 5 + 3 + 9 = 666.

It is not a de Polignac number, because 161641539 - 2¹ = 161641537 is a prime.

It is a super-2 number, since 2×161641539² = 52255974260577042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161641537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390232 + ... + 390645.

It is an arithmetic number, because the mean of its divisors is an integer number (20302828).

Almost surely, 2^161641539 is an apocalyptic number.

161641539 is a deficient number, since it is larger than the sum of its proper divisors (81992397).

161641539 is a wasteful number, since it uses less digits than its factorization.

161641539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780906 (or 780903 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 161641539 is about 12713.8325850233. The cubic root of 161641539 is about 544.7338026104.

The spelling of 161641539 in words is "one hundred sixty-one million, six hundred forty-one thousand, five hundred thirty-nine".