351609481 has 4 divisors (see below), whose sum is σ = 360185364. Its totient is φ = 343033600.

The previous prime is 351609469. The next prime is 351609493. The reversal of 351609481 is 184906153.

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

It is an interprime number because it is at equal distance from previous prime (351609469) and next prime (351609493).

It can be written as a sum of positive squares in 2 ways, for example, as 12313081 + 339296400 = 3509^2 + 18420^2 .

It is a cyclic number.

It is not a de Polignac number, because 351609481 - 2⁵ = 351609449 is a prime.

It is a super-2 number, since 2×351609481² = 247258454258178722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 351609481.

It is not an unprimeable number, because it can be changed into a prime (351609431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4287880 + ... + 4287961.

It is an arithmetic number, because the mean of its divisors is an integer number (90046341).

Almost surely, 2^351609481 is an apocalyptic number.

It is an amenable number.

351609481 is a deficient number, since it is larger than the sum of its proper divisors (8575883).

351609481 is an equidigital number, since it uses as much as digits as its factorization.

351609481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575882.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 351609481 is about 18751.2527848141. The cubic root of 351609481 is about 705.8084590613.

The spelling of 351609481 in words is "three hundred fifty-one million, six hundred nine thousand, four hundred eighty-one".