1245400553 has 4 divisors (see below), whose sum is σ = 1245624708. Its totient is φ = 1245176400.

The previous prime is 1245400547. The next prime is 1245400561. The reversal of 1245400553 is 3550045421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3550045421 = 13 ⋅273080417.

It can be written as a sum of positive squares in 2 ways, for example, as 1046393104 + 199007449 = 32348^2 + 14107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245400553 - 2¹⁴ = 1245384169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245400153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103526 + ... + 114927.

It is an arithmetic number, because the mean of its divisors is an integer number (311406177).

Almost surely, 2^1245400553 is an apocalyptic number.

It is an amenable number.

1245400553 is a deficient number, since it is larger than the sum of its proper divisors (224155).

1245400553 is an equidigital number, since it uses as much as digits as its factorization.

1245400553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224154.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1245400553 is about 35290.2331105931. The cubic root of 1245400553 is about 1075.8944934277.

Adding to 1245400553 its reverse (3550045421), we get a palindrome (4795445974).

The spelling of 1245400553 in words is "one billion, two hundred forty-five million, four hundred thousand, five hundred fifty-three".