161263031 has 2 divisors, whose sum is σ = 161263032. Its totient is φ = 161263030.

The previous prime is 161263027. The next prime is 161263043. The reversal of 161263031 is 130362161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161263031 - 2² = 161263027 is a prime.

It is a super-2 number, since 2×161263031² = 52011530334613922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161262988 and 161263006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161263061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80631515 + 80631516.

It is an arithmetic number, because the mean of its divisors is an integer number (80631516).

Almost surely, 2^161263031 is an apocalyptic number.

161263031 is a deficient number, since it is larger than the sum of its proper divisors (1).

161263031 is an equidigital number, since it uses as much as digits as its factorization.

161263031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 161263031 is about 12698.9381839585. The cubic root of 161263031 is about 544.3082782232.

The spelling of 161263031 in words is "one hundred sixty-one million, two hundred sixty-three thousand, thirty-one".