161636407 has 2 divisors, whose sum is σ = 161636408. Its totient is φ = 161636406.

The previous prime is 161636389. The next prime is 161636411. The reversal of 161636407 is 704636161.

It is a strong prime.

It is an emirp because it is prime and its reverse (704636161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161636407 - 2¹¹ = 161634359 is a prime.

It is a super-2 number, since 2×161636407² = 52252656135739298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161636467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80818203 + 80818204.

It is an arithmetic number, because the mean of its divisors is an integer number (80818204).

Almost surely, 2^161636407 is an apocalyptic number.

161636407 is a deficient number, since it is larger than the sum of its proper divisors (1).

161636407 is an equidigital number, since it uses as much as digits as its factorization.

161636407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 161636407 is about 12713.6307560036. The cubic root of 161636407 is about 544.7280375835.

The spelling of 161636407 in words is "one hundred sixty-one million, six hundred thirty-six thousand, four hundred seven".