162775981 has 2 divisors, whose sum is σ = 162775982. Its totient is φ = 162775980.

The previous prime is 162775967. The next prime is 162776039. The reversal of 162775981 is 189577261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100902025 + 61873956 = 10045^2 + 7866^2 .

It is a cyclic number.

It is not a de Polignac number, because 162775981 - 2¹³ = 162767789 is a prime.

It is a super-2 number, since 2×162775981² = 52992039981024722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162770981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81387990 + 81387991.

It is an arithmetic number, because the mean of its divisors is an integer number (81387991).

Almost surely, 2^162775981 is an apocalyptic number.

It is an amenable number.

162775981 is a deficient number, since it is larger than the sum of its proper divisors (1).

162775981 is an equidigital number, since it uses as much as digits as its factorization.

162775981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 46.

The square root of 162775981 is about 12758.3690572110. The cubic root of 162775981 is about 546.0051936783.

The spelling of 162775981 in words is "one hundred sixty-two million, seven hundred seventy-five thousand, nine hundred eighty-one".