351520985 has 8 divisors (see below), whose sum is σ = 446638536. Its totient is φ = 264674560.

The previous prime is 351520969. The next prime is 351520987. The reversal of 351520985 is 589025153.

It can be written as a sum of positive squares in 4 ways, for example, as 181818256 + 169702729 = 13484^2 + 13027^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 351520985 - 2⁴ = 351520969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351520987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2067686 + ... + 2067855.

It is an arithmetic number, because the mean of its divisors is an integer number (55829817).

Almost surely, 2^351520985 is an apocalyptic number.

It is an amenable number.

351520985 is a deficient number, since it is larger than the sum of its proper divisors (95117551).

351520985 is a wasteful number, since it uses less digits than its factorization.

351520985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135563.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 351520985 is about 18748.8929006488. The cubic root of 351520985 is about 705.7492395106.

The spelling of 351520985 in words is "three hundred fifty-one million, five hundred twenty thousand, nine hundred eighty-five".