1521312017 has 8 divisors (see below), whose sum is σ = 1565337192. Its totient is φ = 1477440000.

The previous prime is 1521311999. The next prime is 1521312041. The reversal of 1521312017 is 7102131251.

It is a Cunningham number, because it is equal to 39004²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 604373056 + 916938961 = 24584^2 + 30281^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1521312017 - 2¹⁶ = 1521246481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1521311983 and 1521312001.

It is not an unprimeable number, because it can be changed into a prime (1521312077) 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, 17984 + ... + 58017.

It is an arithmetic number, because the mean of its divisors is an integer number (195667149).

Almost surely, 2^1521312017 is an apocalyptic number.

It is an amenable number.

1521312017 is a deficient number, since it is larger than the sum of its proper divisors (44025175).

1521312017 is an equidigital number, since it uses as much as digits as its factorization.

1521312017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76579.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1521312017 is about 39004.0000128192. Note that the first 4 decimals coincide. The cubic root of 1521312017 is about 1150.1101386637.

Adding to 1521312017 its reverse (7102131251), we get a palindrome (8623443268).

The spelling of 1521312017 in words is "one billion, five hundred twenty-one million, three hundred twelve thousand, seventeen".