163861631 has 4 divisors (see below), whose sum is σ = 163919064. Its totient is φ = 163804200.

The previous prime is 163861627. The next prime is 163861651. The reversal of 163861631 is 136168361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136168361 = 7 ⋅19452623.

It is a cyclic number.

It is not a de Polignac number, because 163861631 - 2² = 163861627 is a prime.

It is a super-2 number, since 2×163861631² = 53701268227960322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163861591 and 163861600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163861651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24200 + ... + 30221.

It is an arithmetic number, because the mean of its divisors is an integer number (40979766).

Almost surely, 2^163861631 is an apocalyptic number.

163861631 is a deficient number, since it is larger than the sum of its proper divisors (57433).

163861631 is an equidigital number, since it uses as much as digits as its factorization.

163861631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57432.

The product of its digits is 15552, while the sum is 35.

The square root of 163861631 is about 12800.8449330503. The cubic root of 163861631 is about 547.2163829248.

The spelling of 163861631 in words is "one hundred sixty-three million, eight hundred sixty-one thousand, six hundred thirty-one".