1321017985 has 8 divisors (see below), whose sum is σ = 1811681856. Its totient is φ = 905840880.

The previous prime is 1321017983. The next prime is 1321017989. The reversal of 1321017985 is 5897101231.

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

It is not a de Polignac number, because 1321017985 - 2¹ = 1321017983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321017983) 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, 18871651 + ... + 18871720.

It is an arithmetic number, because the mean of its divisors is an integer number (226460232).

Almost surely, 2^1321017985 is an apocalyptic number.

It is an amenable number.

1321017985 is a deficient number, since it is larger than the sum of its proper divisors (490663871).

1321017985 is an equidigital number, since it uses as much as digits as its factorization.

1321017985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37743383.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1321017985 is about 36345.8111066461. The cubic root of 1321017985 is about 1097.2432304912.

The spelling of 1321017985 in words is "one billion, three hundred twenty-one million, seventeen thousand, nine hundred eighty-five".