1245553373 has 4 divisors (see below), whose sum is σ = 1245650400. Its totient is φ = 1245456348.

The previous prime is 1245553369. The next prime is 1245553403. The reversal of 1245553373 is 3733555421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3733555421 = 257 ⋅14527453.

It is a cyclic number.

It is not a de Polignac number, because 1245553373 - 2² = 1245553369 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 (1245553333) 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, 25673 + ... + 56126.

It is an arithmetic number, because the mean of its divisors is an integer number (311412600).

Almost surely, 2^1245553373 is an apocalyptic number.

It is an amenable number.

1245553373 is a deficient number, since it is larger than the sum of its proper divisors (97027).

1245553373 is an equidigital number, since it uses as much as digits as its factorization.

1245553373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97026.

The product of its digits is 189000, while the sum is 38.

The square root of 1245553373 is about 35292.3982324806. The cubic root of 1245553373 is about 1075.9384984057.

The spelling of 1245553373 in words is "one billion, two hundred forty-five million, five hundred fifty-three thousand, three hundred seventy-three".