163508413 has 2 divisors, whose sum is σ = 163508414. Its totient is φ = 163508412.

The previous prime is 163508407. The next prime is 163508417. The reversal of 163508413 is 314805361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129891609 + 33616804 = 11397^2 + 5798^2 .

It is a cyclic number.

It is not a de Polignac number, because 163508413 - 2⁵ = 163508381 is a prime.

It is a super-2 number, since 2×163508413² = 53470002243557138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163508417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81754206 + 81754207.

It is an arithmetic number, because the mean of its divisors is an integer number (81754207).

Almost surely, 2^163508413 is an apocalyptic number.

It is an amenable number.

163508413 is a deficient number, since it is larger than the sum of its proper divisors (1).

163508413 is an equidigital number, since it uses as much as digits as its factorization.

163508413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 163508413 is about 12787.0408226454. The cubic root of 163508413 is about 546.8229092284.

The spelling of 163508413 in words is "one hundred sixty-three million, five hundred eight thousand, four hundred thirteen".