161394031 has 2 divisors, whose sum is σ = 161394032. Its totient is φ = 161394030.

The previous prime is 161394017. The next prime is 161394043. The reversal of 161394031 is 130493161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161394031 - 2¹³ = 161385839 is a prime.

It is a super-2 number, since 2×161394031² = 52096066484857922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161394731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80697015 + 80697016.

It is an arithmetic number, because the mean of its divisors is an integer number (80697016).

Almost surely, 2^161394031 is an apocalyptic number.

161394031 is a deficient number, since it is larger than the sum of its proper divisors (1).

161394031 is an equidigital number, since it uses as much as digits as its factorization.

161394031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 161394031 is about 12704.0950484480. The cubic root of 161394031 is about 544.4556256654.

The spelling of 161394031 in words is "one hundred sixty-one million, three hundred ninety-four thousand, thirty-one".