351894989 has 4 divisors (see below), whose sum is σ = 351937500. Its totient is φ = 351852480.

The previous prime is 351894979. The next prime is 351895021. The reversal of 351894989 is 989498153.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 989498153 = 7 ⋅141356879.

It can be written as a sum of positive squares in 2 ways, for example, as 307406089 + 44488900 = 17533^2 + 6670^2 .

It is a cyclic number.

It is not a de Polignac number, because 351894989 - 2⁴ = 351894973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351894979) 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, 4364 + ... + 26885.

It is an arithmetic number, because the mean of its divisors is an integer number (87984375).

Almost surely, 2^351894989 is an apocalyptic number.

It is an amenable number.

351894989 is a deficient number, since it is larger than the sum of its proper divisors (42511).

351894989 is a wasteful number, since it uses less digits than its factorization.

351894989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42510.

The product of its digits is 2799360, while the sum is 56.

The square root of 351894989 is about 18758.8642779887. The cubic root of 351894989 is about 705.9994469363. Note that the first 3 decimals are identical.

The spelling of 351894989 in words is "three hundred fifty-one million, eight hundred ninety-four thousand, nine hundred eighty-nine".