161850971 has 2 divisors, whose sum is σ = 161850972. Its totient is φ = 161850970.

The previous prime is 161850851. The next prime is 161850973. The reversal of 161850971 is 179058161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161850971 - 2¹⁸ = 161588827 is a prime.

Together with 161850973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161850973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80925485 + 80925486.

It is an arithmetic number, because the mean of its divisors is an integer number (80925486).

Almost surely, 2^161850971 is an apocalyptic number.

161850971 is a deficient number, since it is larger than the sum of its proper divisors (1).

161850971 is an equidigital number, since it uses as much as digits as its factorization.

161850971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 161850971 is about 12722.0663022954. The cubic root of 161850971 is about 544.9689638079.

The spelling of 161850971 in words is "one hundred sixty-one million, eight hundred fifty thousand, nine hundred seventy-one".