1353240521 has 4 divisors (see below), whose sum is σ = 1366639044. Its totient is φ = 1339842000.

The previous prime is 1353240509. The next prime is 1353240557. The reversal of 1353240521 is 1250423531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1222481296 + 130759225 = 34964^2 + 11435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1353240521 - 2¹⁸ = 1352978377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1353248521) 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, 6699110 + ... + 6699311.

It is an arithmetic number, because the mean of its divisors is an integer number (341659761).

Almost surely, 2^1353240521 is an apocalyptic number.

It is an amenable number.

1353240521 is a deficient number, since it is larger than the sum of its proper divisors (13398523).

1353240521 is a wasteful number, since it uses less digits than its factorization.

1353240521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13398522.

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

The square root of 1353240521 is about 36786.4176157451. The cubic root of 1353240521 is about 1106.0930527086.

The spelling of 1353240521 in words is "one billion, three hundred fifty-three million, two hundred forty thousand, five hundred twenty-one".