166841431 has 2 divisors, whose sum is σ = 166841432. Its totient is φ = 166841430.

The previous prime is 166841429. The next prime is 166841453. The reversal of 166841431 is 134148661.

It is a weak prime.

It is an emirp because it is prime and its reverse (134148661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166841431 - 2¹ = 166841429 is a prime.

It is a super-2 number, since 2×166841431² = 55672126196255522, which contains 22 as substring.

Together with 166841429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166841491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83420715 + 83420716.

It is an arithmetic number, because the mean of its divisors is an integer number (83420716).

Almost surely, 2^166841431 is an apocalyptic number.

166841431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166841431 is an equidigital number, since it uses as much as digits as its factorization.

166841431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 166841431 is about 12916.7113074497. The cubic root of 166841431 is about 550.5134939935.

The spelling of 166841431 in words is "one hundred sixty-six million, eight hundred forty-one thousand, four hundred thirty-one".