163949831 has 4 divisors (see below), whose sum is σ = 164067600. Its totient is φ = 163832064.

The previous prime is 163949827. The next prime is 163949861. The reversal of 163949831 is 138949361.

163949831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 163949831 - 2² = 163949827 is a prime.

It is a super-2 number, since 2×163949831² = 53759094169857122, 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 (163949861) 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, 56771 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (41016900).

Almost surely, 2^163949831 is an apocalyptic number.

163949831 is a deficient number, since it is larger than the sum of its proper divisors (117769).

163949831 is a wasteful number, since it uses less digits than its factorization.

163949831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117768.

The product of its digits is 139968, while the sum is 44.

The square root of 163949831 is about 12804.2895546766. The cubic root of 163949831 is about 547.3145466981.

The spelling of 163949831 in words is "one hundred sixty-three million, nine hundred forty-nine thousand, eight hundred thirty-one".