1520944853 has 4 divisors (see below), whose sum is σ = 1541779788. Its totient is φ = 1500109920.

The previous prime is 1520944849. The next prime is 1520944939. The reversal of 1520944853 is 3584490251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3584490251 = 131 ⋅27362521.

It can be written as a sum of positive squares in 2 ways, for example, as 410589169 + 1110355684 = 20263^2 + 33322^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520944853 - 2² = 1520944849 is a prime.

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 1520944853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520949853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10417358 + ... + 10417503.

It is an arithmetic number, because the mean of its divisors is an integer number (385444947).

Almost surely, 2^1520944853 is an apocalyptic number.

It is an amenable number.

1520944853 is a deficient number, since it is larger than the sum of its proper divisors (20834935).

1520944853 is an equidigital number, since it uses as much as digits as its factorization.

1520944853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20834934.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 1520944853 is about 38999.2929807708. The cubic root of 1520944853 is about 1150.0176060317.

The spelling of 1520944853 in words is "one billion, five hundred twenty million, nine hundred forty-four thousand, eight hundred fifty-three".