1247109481 has 2 divisors, whose sum is σ = 1247109482. Its totient is φ = 1247109480.

The previous prime is 1247109469. The next prime is 1247109547. The reversal of 1247109481 is 1849017421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766403856 + 480705625 = 27684^2 + 21925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247109481 - 2¹⁵ = 1247076713 is a prime.

It is a super-2 number, since 2×1247109481² = 3110564115200178722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1247109481.

It is not a weakly prime, because it can be changed into another prime (1247109181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623554740 + 623554741.

It is an arithmetic number, because the mean of its divisors is an integer number (623554741).

Almost surely, 2^1247109481 is an apocalyptic number.

It is an amenable number.

1247109481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247109481 is an equidigital number, since it uses as much as digits as its factorization.

1247109481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1247109481 is about 35314.4372884519. The cubic root of 1247109481 is about 1076.3863795866.

The spelling of 1247109481 in words is "one billion, two hundred forty-seven million, one hundred nine thousand, four hundred eighty-one".