163903951 has 2 divisors, whose sum is σ = 163903952. Its totient is φ = 163903950.

The previous prime is 163903939. The next prime is 163903973. The reversal of 163903951 is 159309361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163903951 - 2²³ = 155515343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163903951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163903921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81951975 + 81951976.

It is an arithmetic number, because the mean of its divisors is an integer number (81951976).

Almost surely, 2^163903951 is an apocalyptic number.

163903951 is a deficient number, since it is larger than the sum of its proper divisors (1).

163903951 is an equidigital number, since it uses as much as digits as its factorization.

163903951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 163903951 is about 12802.4978422181. The cubic root of 163903951 is about 547.2634881233.

The spelling of 163903951 in words is "one hundred sixty-three million, nine hundred three thousand, nine hundred fifty-one".