1263887515 has 16 divisors (see below), whose sum is σ = 1707918336. Its totient is φ = 889538400.

The previous prime is 1263887507. The next prime is 1263887539. The reversal of 1263887515 is 5157883621.

It is not a de Polignac number, because 1263887515 - 2³ = 1263887507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368937 + ... + 372346.

It is an arithmetic number, because the mean of its divisors is an integer number (106744896).

Almost surely, 2^1263887515 is an apocalyptic number.

1263887515 is a deficient number, since it is larger than the sum of its proper divisors (444030821).

1263887515 is a wasteful number, since it uses less digits than its factorization.

1263887515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741330.

The product of its digits is 403200, while the sum is 46.

The square root of 1263887515 is about 35551.1956901593. The cubic root of 1263887515 is about 1081.1919610220.

It can be divided in two parts, 126388 and 7515, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 1263887515 in words is "one billion, two hundred sixty-three million, eight hundred eighty-seven thousand, five hundred fifteen".