1521340985 has 8 divisors (see below), whose sum is σ = 1826476296. Its totient is φ = 1216494720.

The previous prime is 1521340967. The next prime is 1521340987. The reversal of 1521340985 is 5890431251.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3225616 + 1518115369 = 1796^2 + 38963^2 .

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

It is not a de Polignac number, because 1521340985 - 2¹⁸ = 1521078841 is a prime.

It is a super-3 number, since 3×1521340985³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521340987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60506 + ... + 81875.

It is an arithmetic number, because the mean of its divisors is an integer number (228309537).

Almost surely, 2^1521340985 is an apocalyptic number.

It is an amenable number.

1521340985 is a deficient number, since it is larger than the sum of its proper divisors (305135311).

1521340985 is a wasteful number, since it uses less digits than its factorization.

1521340985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144523.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1521340985 is about 39004.3713575799. The cubic root of 1521340985 is about 1150.1174385423.

The spelling of 1521340985 in words is "one billion, five hundred twenty-one million, three hundred forty thousand, nine hundred eighty-five".