1245553457 has 4 divisors (see below), whose sum is σ = 1245630576. Its totient is φ = 1245476340.

The previous prime is 1245553453. The next prime is 1245553469. The reversal of 1245553457 is 7543555421.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1245553457 - 2² = 1245553453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245553453) 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, 4019 + ... + 50072.

It is an arithmetic number, because the mean of its divisors is an integer number (311407644).

Almost surely, 2^1245553457 is an apocalyptic number.

It is an amenable number.

1245553457 is a deficient number, since it is larger than the sum of its proper divisors (77119).

1245553457 is an equidigital number, since it uses as much as digits as its factorization.

1245553457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77118.

The product of its digits is 420000, while the sum is 41.

The square root of 1245553457 is about 35292.3994225386. The cubic root of 1245553457 is about 1075.9385225928.

The spelling of 1245553457 in words is "one billion, two hundred forty-five million, five hundred fifty-three thousand, four hundred fifty-seven".