163507431 has 4 divisors (see below), whose sum is σ = 218009912. Its totient is φ = 109004952.

The previous prime is 163507417. The next prime is 163507451. The reversal of 163507431 is 134705361.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 163507431 - 2⁶ = 163507367 is a prime.

It is a super-2 number, since 2×163507431² = 53469359984439522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163507451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27251236 + ... + 27251241.

It is an arithmetic number, because the mean of its divisors is an integer number (54502478).

Almost surely, 2^163507431 is an apocalyptic number.

163507431 is a deficient number, since it is larger than the sum of its proper divisors (54502481).

163507431 is an equidigital number, since it uses as much as digits as its factorization.

163507431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54502480.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 163507431 is about 12787.0024243370. The cubic root of 163507431 is about 546.8218145218.

The spelling of 163507431 in words is "one hundred sixty-three million, five hundred seven thousand, four hundred thirty-one".