161391827 has 2 divisors, whose sum is σ = 161391828. Its totient is φ = 161391826.

The previous prime is 161391793. The next prime is 161391847. The reversal of 161391827 is 728193161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161391827 - 2¹² = 161387731 is a prime.

It is not a weakly prime, because it can be changed into another prime (161391847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80695913 + 80695914.

It is an arithmetic number, because the mean of its divisors is an integer number (80695914).

Almost surely, 2^161391827 is an apocalyptic number.

161391827 is a deficient number, since it is larger than the sum of its proper divisors (1).

161391827 is an equidigital number, since it uses as much as digits as its factorization.

161391827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 161391827 is about 12704.0083044683. The cubic root of 161391827 is about 544.4531472887.

The spelling of 161391827 in words is "one hundred sixty-one million, three hundred ninety-one thousand, eight hundred twenty-seven".