169139961 has 32 divisors (see below), whose sum is σ = 257904000. Its totient is φ = 109511424.

The previous prime is 169139951. The next prime is 169139983. The reversal of 169139961 is 169931961.

It is not a de Polignac number, because 169139961 - 2⁷ = 169139833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (169139911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141181 + ... + 142373.

It is an arithmetic number, because the mean of its divisors is an integer number (8059500).

Almost surely, 2^169139961 is an apocalyptic number.

It is an amenable number.

169139961 is a deficient number, since it is larger than the sum of its proper divisors (88764039).

169139961 is a wasteful number, since it uses less digits than its factorization.

169139961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1344 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 169139961 is about 13005.3820013101. The cubic root of 169139961 is about 553.0300650628.

The spelling of 169139961 in words is "one hundred sixty-nine million, one hundred thirty-nine thousand, nine hundred sixty-one".