1521320453 has 8 divisors (see below), whose sum is σ = 1568929560. Its totient is φ = 1474053120.

The previous prime is 1521320431. The next prime is 1521320467. The reversal of 1521320453 is 3540231251.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 923126689 + 598193764 = 30383^2 + 24458^2 .

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 1521320453 - 2²⁶ = 1454211589 is a prime.

It is a super-2 number, since 2×1521320453² = 4628831841432250418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521320413) 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 7 ways as a sum of consecutive naturals, for example, 76388 + ... + 94221.

It is an arithmetic number, because the mean of its divisors is an integer number (196116195).

Almost surely, 2^1521320453 is an apocalyptic number.

It is an amenable number.

1521320453 is a deficient number, since it is larger than the sum of its proper divisors (47609107).

1521320453 is a wasteful number, since it uses less digits than its factorization.

1521320453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170887.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1521320453 is about 39004.1081554238. The cubic root of 1521320453 is about 1150.1122645286.

The spelling of 1521320453 in words is "one billion, five hundred twenty-one million, three hundred twenty thousand, four hundred fifty-three".