161485831 has 4 divisors (see below), whose sum is σ = 173907832. Its totient is φ = 149063832.

The previous prime is 161485813. The next prime is 161485861. The reversal of 161485831 is 138584161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138584161 = 1601 ⋅86561.

It is a cyclic number.

It is not a de Polignac number, because 161485831 - 2¹¹ = 161483783 is a prime.

It is a super-3 number, since 3×161485831³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161485801) 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, 6210981 + ... + 6211006.

It is an arithmetic number, because the mean of its divisors is an integer number (43476958).

Almost surely, 2^161485831 is an apocalyptic number.

161485831 is a deficient number, since it is larger than the sum of its proper divisors (12422001).

161485831 is a wasteful number, since it uses less digits than its factorization.

161485831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12422000.

The product of its digits is 23040, while the sum is 37.

The square root of 161485831 is about 12707.7075430622. The cubic root of 161485831 is about 544.5588338465.

The spelling of 161485831 in words is "one hundred sixty-one million, four hundred eighty-five thousand, eight hundred thirty-one".