161825031 has 6 divisors (see below), whose sum is σ = 233747280. Its totient is φ = 107883348.

The previous prime is 161825029. The next prime is 161825077. The reversal of 161825031 is 130528161.

It is not a de Polignac number, because 161825031 - 2¹ = 161825029 is a prime.

It is a super-2 number, since 2×161825031² = 52374681316301922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161824986 and 161825004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161825021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8990271 + ... + 8990288.

It is an arithmetic number, because the mean of its divisors is an integer number (38957880).

Almost surely, 2^161825031 is an apocalyptic number.

161825031 is a deficient number, since it is larger than the sum of its proper divisors (71922249).

161825031 is a wasteful number, since it uses less digits than its factorization.

161825031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17980565 (or 17980562 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 161825031 is about 12721.0467729664. The cubic root of 161825031 is about 544.9398480312.

The spelling of 161825031 in words is "one hundred sixty-one million, eight hundred twenty-five thousand, thirty-one".