1264542481 has 4 divisors (see below), whose sum is σ = 1268531892. Its totient is φ = 1260553072.

The previous prime is 1264542479. The next prime is 1264542491. The reversal of 1264542481 is 1842454621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 186076881 + 1078465600 = 13641^2 + 32840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264542481 - 2¹ = 1264542479 is a prime.

It is a super-2 number, since 2×1264542481² = 3198135372507270722, 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 1264542481.

It is not an unprimeable number, because it can be changed into a prime (1264542401) 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, 1994230 + ... + 1994863.

It is an arithmetic number, because the mean of its divisors is an integer number (317132973).

Almost surely, 2^1264542481 is an apocalyptic number.

It is an amenable number.

1264542481 is a deficient number, since it is larger than the sum of its proper divisors (3989411).

1264542481 is an equidigital number, since it uses as much as digits as its factorization.

1264542481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989410.

The product of its digits is 61440, while the sum is 37.

The square root of 1264542481 is about 35560.4060859828. The cubic root of 1264542481 is about 1081.3786922190.

The spelling of 1264542481 in words is "one billion, two hundred sixty-four million, five hundred forty-two thousand, four hundred eighty-one".