1281530715 has 16 divisors (see below), whose sum is σ = 2158368000. Its totient is φ = 647510112.

The previous prime is 1281530699. The next prime is 1281530741. The reversal of 1281530715 is 5170351821.

It is not a de Polignac number, because 1281530715 - 2⁴ = 1281530699 is a prime.

It is a super-2 number, since 2×1281530715² = 3284641946976822450, which contains 22 as substring.

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, 2248015 + ... + 2248584.

It is an arithmetic number, because the mean of its divisors is an integer number (134898000).

Almost surely, 2^1281530715 is an apocalyptic number.

1281530715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281530715 is a deficient number, since it is larger than the sum of its proper divisors (876837285).

1281530715 is a wasteful number, since it uses less digits than its factorization.

1281530715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4496626.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 1281530715 is about 35798.4736406456. The cubic root of 1281530715 is about 1086.1996866984.

It can be divided in two parts, 1281 and 530715, that added together give a triangular number (531996 = T₁₀₃₁).

The spelling of 1281530715 in words is "one billion, two hundred eighty-one million, five hundred thirty thousand, seven hundred fifteen".