1253544721 has 8 divisors (see below), whose sum is σ = 1472696064. Its totient is φ = 1051925520.

The previous prime is 1253544707. The next prime is 1253544731. The reversal of 1253544721 is 1274453521.

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 1253544721 - 2¹¹ = 1253542673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1253544731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4382881 + ... + 4383166.

It is an arithmetic number, because the mean of its divisors is an integer number (184087008).

Almost surely, 2^1253544721 is an apocalyptic number.

1253544721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1253544721 is a deficient number, since it is larger than the sum of its proper divisors (219151343).

1253544721 is a wasteful number, since it uses less digits than its factorization.

1253544721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766071.

The product of its digits is 33600, while the sum is 34.

The square root of 1253544721 is about 35405.4334954397. The cubic root of 1253544721 is about 1078.2346333387.

The spelling of 1253544721 in words is "one billion, two hundred fifty-three million, five hundred forty-four thousand, seven hundred twenty-one".