1225443451 has 2 divisors, whose sum is σ = 1225443452. Its totient is φ = 1225443450.

The previous prime is 1225443449. The next prime is 1225443463. The reversal of 1225443451 is 1543445221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225443451 - 2¹ = 1225443449 is a prime.

Together with 1225443449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1225443421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612721725 + 612721726.

It is an arithmetic number, because the mean of its divisors is an integer number (612721726).

Almost surely, 2^1225443451 is an apocalyptic number.

1225443451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225443451 is an equidigital number, since it uses as much as digits as its factorization.

1225443451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

The square root of 1225443451 is about 35006.3344410694. The cubic root of 1225443451 is about 1070.1165771025.

Adding to 1225443451 its reverse (1543445221), we get a palindrome (2768888672).

The spelling of 1225443451 in words is "one billion, two hundred twenty-five million, four hundred forty-three thousand, four hundred fifty-one".