1240553521 has 4 divisors (see below), whose sum is σ = 1240783344. Its totient is φ = 1240323700.

The previous prime is 1240553519. The next prime is 1240553539. The reversal of 1240553521 is 1253550421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240553521 - 2¹ = 1240553519 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 1240553521.

It is not an unprimeable number, because it can be changed into a prime (1240553551) 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, 106615 + ... + 117676.

It is an arithmetic number, because the mean of its divisors is an integer number (310195836).

Almost surely, 2^1240553521 is an apocalyptic number.

It is an amenable number.

1240553521 is a deficient number, since it is larger than the sum of its proper divisors (229823).

1240553521 is an equidigital number, since it uses as much as digits as its factorization.

1240553521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229822.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1240553521 is about 35221.4923164820. The cubic root of 1240553521 is about 1074.4969042329.

The spelling of 1240553521 in words is "one billion, two hundred forty million, five hundred fifty-three thousand, five hundred twenty-one".