161263131 has 16 divisors (see below), whose sum is σ = 221727264. Its totient is φ = 104177664.

The previous prime is 161263073. The next prime is 161263133. The reversal of 161263131 is 131362161.

It is not a de Polignac number, because 161263131 - 2¹⁰ = 161262107 is a prime.

It is a super-2 number, since 2×161263131² = 52011594839846322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161263133) 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, 25701 + ... + 31353.

It is an arithmetic number, because the mean of its divisors is an integer number (13857954).

Almost surely, 2^161263131 is an apocalyptic number.

161263131 is a deficient number, since it is larger than the sum of its proper divisors (60464133).

161263131 is a wasteful number, since it uses less digits than its factorization.

161263131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5950.

The product of its digits is 648, while the sum is 24.

The square root of 161263131 is about 12698.9421212950. The cubic root of 161263131 is about 544.3083907326.

The spelling of 161263131 in words is "one hundred sixty-one million, two hundred sixty-three thousand, one hundred thirty-one".