402161369 has 2 divisors, whose sum is σ = 402161370. Its totient is φ = 402161368.

The previous prime is 402161339. The next prime is 402161377. The reversal of 402161369 is 963161204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308458969 + 93702400 = 17563^2 + 9680^2 .

It is a cyclic number.

It is not a de Polignac number, because 402161369 - 2²⁰ = 401112793 is a prime.

It is a super-2 number, since 2×402161369² = 323467533431908322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402161339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201080684 + 201080685.

It is an arithmetic number, because the mean of its divisors is an integer number (201080685).

Almost surely, 2^402161369 is an apocalyptic number.

It is an amenable number.

402161369 is a deficient number, since it is larger than the sum of its proper divisors (1).

402161369 is an equidigital number, since it uses as much as digits as its factorization.

402161369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 402161369 is about 20053.9614291042. The cubic root of 402161369 is about 738.1310085110.

The spelling of 402161369 in words is "four hundred two million, one hundred sixty-one thousand, three hundred sixty-nine".