1248433621 has 4 divisors (see below), whose sum is σ = 1250675532. Its totient is φ = 1246191712.

The previous prime is 1248433619. The next prime is 1248433633. The reversal of 1248433621 is 1263348421.

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 278422596 + 970011025 = 16686^2 + 31145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1248433621 - 2¹ = 1248433619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248433661) 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, 1120120 + ... + 1121233.

It is an arithmetic number, because the mean of its divisors is an integer number (312668883).

Almost surely, 2^1248433621 is an apocalyptic number.

It is an amenable number.

1248433621 is a deficient number, since it is larger than the sum of its proper divisors (2241911).

1248433621 is an equidigital number, since it uses as much as digits as its factorization.

1248433621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241910.

The product of its digits is 27648, while the sum is 34.

The square root of 1248433621 is about 35333.1801710517. The cubic root of 1248433621 is about 1076.7672021043.

The spelling of 1248433621 in words is "one billion, two hundred forty-eight million, four hundred thirty-three thousand, six hundred twenty-one".