161258139 has 24 divisors (see below), whose sum is σ = 268799232. Its totient is φ = 91249200.

The previous prime is 161258137. The next prime is 161258147. The reversal of 161258139 is 931852161.

161258139 is a `hidden beast` number, since 1 + 612 + 5 + 8 + 1 + 39 = 666.

It is not a de Polignac number, because 161258139 - 2¹ = 161258137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161258131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5937 + ... + 18914.

It is an arithmetic number, because the mean of its divisors is an integer number (11199968).

Almost surely, 2^161258139 is an apocalyptic number.

161258139 is a deficient number, since it is larger than the sum of its proper divisors (107541093).

161258139 is a wasteful number, since it uses less digits than its factorization.

161258139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24967 (or 24964 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 161258139 is about 12698.7455679685. The cubic root of 161258139 is about 544.3027742070.

The spelling of 161258139 in words is "one hundred sixty-one million, two hundred fifty-eight thousand, one hundred thirty-nine".