1245889147 has 4 divisors (see below), whose sum is σ = 1311462280. Its totient is φ = 1180316016.

The previous prime is 1245889111. The next prime is 1245889153. The reversal of 1245889147 is 7419885421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1245889147 - 2¹¹ = 1245887099 is a prime.

It is a super-2 number, since 2×1245889147² = 3104479533224775218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245889147.

It is not an unprimeable number, because it can be changed into a prime (1245889157) 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, 32786538 + ... + 32786575.

It is an arithmetic number, because the mean of its divisors is an integer number (327865570).

Almost surely, 2^1245889147 is an apocalyptic number.

1245889147 is a deficient number, since it is larger than the sum of its proper divisors (65573133).

1245889147 is an equidigital number, since it uses as much as digits as its factorization.

1245889147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65573132.

The product of its digits is 645120, while the sum is 49.

The square root of 1245889147 is about 35297.1549420063. The cubic root of 1245889147 is about 1076.0351728966.

The spelling of 1245889147 in words is "one billion, two hundred forty-five million, eight hundred eighty-nine thousand, one hundred forty-seven".