1298557947 has 4 divisors (see below), whose sum is σ = 1731410600. Its totient is φ = 865705296.

The previous prime is 1298557901. The next prime is 1298557951. The reversal of 1298557947 is 7497558921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7497558921 = 3 ⋅2499186307.

It is not a de Polignac number, because 1298557947 - 2¹¹ = 1298555899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1298559947) 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, 216426322 + ... + 216426327.

It is an arithmetic number, because the mean of its divisors is an integer number (432852650).

Almost surely, 2^1298557947 is an apocalyptic number.

1298557947 is a deficient number, since it is larger than the sum of its proper divisors (432852653).

1298557947 is an equidigital number, since it uses as much as digits as its factorization.

1298557947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432852652.

The product of its digits is 6350400, while the sum is 57.

The square root of 1298557947 is about 36035.5095287967. The cubic root of 1298557947 is about 1090.9891833993.

The spelling of 1298557947 in words is "one billion, two hundred ninety-eight million, five hundred fifty-seven thousand, nine hundred forty-seven".