161145031 has 2 divisors, whose sum is σ = 161145032. Its totient is φ = 161145030.

The previous prime is 161145029. The next prime is 161145041. The reversal of 161145031 is 130541161.

161145031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161145031 - 2¹ = 161145029 is a prime.

It is a super-2 number, since 2×161145031² = 51935442031981922, which contains 22 as substring.

Together with 161145029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161144993 and 161145011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161145041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80572515 + 80572516.

It is an arithmetic number, because the mean of its divisors is an integer number (80572516).

Almost surely, 2^161145031 is an apocalyptic number.

161145031 is a deficient number, since it is larger than the sum of its proper divisors (1).

161145031 is an equidigital number, since it uses as much as digits as its factorization.

161145031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 161145031 is about 12694.2912760028. The cubic root of 161145031 is about 544.1754847189.

Adding to 161145031 its reverse (130541161), we get a palindrome (291686192).

The spelling of 161145031 in words is "one hundred sixty-one million, one hundred forty-five thousand, thirty-one".