1373247553 has 4 divisors (see below), whose sum is σ = 1445523760. Its totient is φ = 1300971348.

The previous prime is 1373247493. The next prime is 1373247583. The reversal of 1373247553 is 3557423731.

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 an emirpimes, since its reverse is a distinct semiprime: 3557423731 = 23 ⋅154670597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1373247553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1373247583) 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, 36138075 + ... + 36138112.

It is an arithmetic number, because the mean of its divisors is an integer number (361380940).

Almost surely, 2^1373247553 is an apocalyptic number.

It is an amenable number.

1373247553 is a deficient number, since it is larger than the sum of its proper divisors (72276207).

1373247553 is an equidigital number, since it uses as much as digits as its factorization.

1373247553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72276206.

The product of its digits is 264600, while the sum is 40.

The square root of 1373247553 is about 37057.3549110025. The cubic root of 1373247553 is about 1111.5174314460.

The spelling of 1373247553 in words is "one billion, three hundred seventy-three million, two hundred forty-seven thousand, five hundred fifty-three".