161585139 has 16 divisors (see below), whose sum is σ = 227290880. Its totient is φ = 101826720.

The previous prime is 161585117. The next prime is 161585159. The reversal of 161585139 is 931585161.

It is not a de Polignac number, because 161585139 - 2¹⁷ = 161454067 is a prime.

It is a super-2 number, since 2×161585139² = 52219514291298642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161585097 and 161585106.

It is not an unprimeable number, because it can be changed into a prime (161585159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24849 + ... + 30669.

It is an arithmetic number, because the mean of its divisors is an integer number (14205680).

Almost surely, 2^161585139 is an apocalyptic number.

161585139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

161585139 is a deficient number, since it is larger than the sum of its proper divisors (65705741).

161585139 is a wasteful number, since it uses less digits than its factorization.

161585139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6330.

The product of its digits is 32400, while the sum is 39.

The square root of 161585139 is about 12711.6143349301. The cubic root of 161585139 is about 544.6704390290.

The spelling of 161585139 in words is "one hundred sixty-one million, five hundred eighty-five thousand, one hundred thirty-nine".