1389257553 has 4 divisors (see below), whose sum is σ = 1852343408. Its totient is φ = 926171700.

The previous prime is 1389257539. The next prime is 1389257567. The reversal of 1389257553 is 3557529831.

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: 3557529831 = 3 ⋅1185843277.

It is an interprime number because it is at equal distance from previous prime (1389257539) and next prime (1389257567).

It is not a de Polignac number, because 1389257553 - 2¹⁰ = 1389256529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389257503) 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, 231542923 + ... + 231542928.

It is an arithmetic number, because the mean of its divisors is an integer number (463085852).

Almost surely, 2^1389257553 is an apocalyptic number.

It is an amenable number.

1389257553 is a deficient number, since it is larger than the sum of its proper divisors (463085855).

1389257553 is an equidigital number, since it uses as much as digits as its factorization.

1389257553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463085854.

The product of its digits is 1134000, while the sum is 48.

The square root of 1389257553 is about 37272.7454448958. The cubic root of 1389257553 is about 1115.8202930984.

The spelling of 1389257553 in words is "one billion, three hundred eighty-nine million, two hundred fifty-seven thousand, five hundred fifty-three".