1261523464 has 8 divisors (see below), whose sum is σ = 2365356510. Its totient is φ = 630761728.

The previous prime is 1261523413. The next prime is 1261523491. The reversal of 1261523464 is 4643251621.

It can be written as a sum of positive squares in only one way, i.e., 970820964 + 290702500 = 31158^2 + 17050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 78845209 + ... + 78845224.

Almost surely, 2^1261523464 is an apocalyptic number.

It is an amenable number.

1261523464 is a deficient number, since it is larger than the sum of its proper divisors (1103833046).

1261523464 is a wasteful number, since it uses less digits than its factorization.

1261523464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157690439 (or 157690435 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 1261523464 is about 35517.9315839197. The cubic root of 1261523464 is about 1080.5174315269.

The spelling of 1261523464 in words is "one billion, two hundred sixty-one million, five hundred twenty-three thousand, four hundred sixty-four".