1243532451 has 16 divisors (see below), whose sum is σ = 1898720000. Its totient is φ = 709159968.

The previous prime is 1243532447. The next prime is 1243532461. The reversal of 1243532451 is 1542353421.

It is not a de Polignac number, because 1243532451 - 2² = 1243532447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243532401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48856 + ... + 69813.

It is an arithmetic number, because the mean of its divisors is an integer number (118670000).

Almost surely, 2^1243532451 is an apocalyptic number.

1243532451 is a deficient number, since it is larger than the sum of its proper divisors (655187549).

1243532451 is a wasteful number, since it uses less digits than its factorization.

1243532451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119178.

The product of its digits is 14400, while the sum is 30.

The square root of 1243532451 is about 35263.7554863347. The cubic root of 1243532451 is about 1075.3562766456.

Adding to 1243532451 its reverse (1542353421), we get a palindrome (2785885872).

The spelling of 1243532451 in words is "one billion, two hundred forty-three million, five hundred thirty-two thousand, four hundred fifty-one".