1261504264 has 16 divisors (see below), whose sum is σ = 2365728300. Its totient is φ = 630643392.

The previous prime is 1261504249. The next prime is 1261504267. The reversal of 1261504264 is 4624051621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1083068100 + 178436164 = 32910^2 + 13358^2 .

It is not an unprimeable number, because it can be changed into a prime (1261504267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57714 + ... + 76510.

Almost surely, 2^1261504264 is an apocalyptic number.

It is an amenable number.

1261504264 is a deficient number, since it is larger than the sum of its proper divisors (1104224036).

1261504264 is a wasteful number, since it uses less digits than its factorization.

1261504264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27192 (or 27188 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1261504264 is about 35517.6612968816. The cubic root of 1261504264 is about 1080.5119497845.

Adding to 1261504264 its reverse (4624051621), we get a palindrome (5885555885).

It can be divided in two parts, 126150 and 4264, that multiplied together give a triangular number (537903600 = T₃₂₇₉₉).

The spelling of 1261504264 in words is "one billion, two hundred sixty-one million, five hundred four thousand, two hundred sixty-four".