162905861 has 2 divisors, whose sum is σ = 162905862. Its totient is φ = 162905860.

The previous prime is 162905839. The next prime is 162905863. The reversal of 162905861 is 168509261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 63504961 = 9970^2 + 7969^2 .

It is a cyclic number.

It is not a de Polignac number, because 162905861 - 2⁶ = 162905797 is a prime.

Together with 162905863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162905863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81452930 + 81452931.

It is an arithmetic number, because the mean of its divisors is an integer number (81452931).

Almost surely, 2^162905861 is an apocalyptic number.

It is an amenable number.

162905861 is a deficient number, since it is larger than the sum of its proper divisors (1).

162905861 is an equidigital number, since it uses as much as digits as its factorization.

162905861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 162905861 is about 12763.4580345610. The cubic root of 162905861 is about 546.1503754209.

The spelling of 162905861 in words is "one hundred sixty-two million, nine hundred five thousand, eight hundred sixty-one".