161210031 has 16 divisors (see below), whose sum is σ = 227867904. Its totient is φ = 101028224.

The previous prime is 161210029. The next prime is 161210051. The reversal of 161210031 is 130012161.

It is a cyclic number.

It is not a de Polignac number, because 161210031 - 2¹ = 161210029 is a prime.

It is a super-2 number, since 2×161210031² = 51977348190041922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161210011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59206 + ... + 61868.

It is an arithmetic number, because the mean of its divisors is an integer number (14241744).

Almost surely, 2^161210031 is an apocalyptic number.

161210031 is a deficient number, since it is larger than the sum of its proper divisors (66657873).

161210031 is a wasteful number, since it uses less digits than its factorization.

161210031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 161210031 is about 12696.8512238271. The cubic root of 161210031 is about 544.2486416995.

Adding to 161210031 its reverse (130012161), we get a palindrome (291222192).

The spelling of 161210031 in words is "one hundred sixty-one million, two hundred ten thousand, thirty-one".