162813881 has 2 divisors, whose sum is σ = 162813882. Its totient is φ = 162813880.

The previous prime is 162813877. The next prime is 162813901. The reversal of 162813881 is 188318261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150675625 + 12138256 = 12275^2 + 3484^2 .

It is an emirp because it is prime and its reverse (188318261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162813881 - 2² = 162813877 is a prime.

It is a super-2 number, since 2×162813881² = 53016719692564322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162813181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81406940 + 81406941.

It is an arithmetic number, because the mean of its divisors is an integer number (81406941).

Almost surely, 2^162813881 is an apocalyptic number.

It is an amenable number.

162813881 is a deficient number, since it is larger than the sum of its proper divisors (1).

162813881 is an equidigital number, since it uses as much as digits as its factorization.

162813881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 38.

The square root of 162813881 is about 12759.8542703277. The cubic root of 162813881 is about 546.0475668238.

The spelling of 162813881 in words is "one hundred sixty-two million, eight hundred thirteen thousand, eight hundred eighty-one".