161574139 has 4 divisors (see below), whose sum is σ = 166786240. Its totient is φ = 156362040.

The previous prime is 161574131. The next prime is 161574169. The reversal of 161574139 is 931475161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931475161 = 16493 ⋅56477.

It is a cyclic number.

It is not a de Polignac number, because 161574139 - 2³ = 161574131 is a prime.

It is a super-2 number, since 2×161574139² = 52212404787182642, 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 = 161574098 and 161574107.

It is not an unprimeable number, because it can be changed into a prime (161574131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2606004 + ... + 2606065.

It is an arithmetic number, because the mean of its divisors is an integer number (41696560).

Almost surely, 2^161574139 is an apocalyptic number.

161574139 is a deficient number, since it is larger than the sum of its proper divisors (5212101).

161574139 is an equidigital number, since it uses as much as digits as its factorization.

161574139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212100.

The product of its digits is 22680, while the sum is 37.

The square root of 161574139 is about 12711.1816523878. The cubic root of 161574139 is about 544.6580791655.

The spelling of 161574139 in words is "one hundred sixty-one million, five hundred seventy-four thousand, one hundred thirty-nine".