1265140899 has 24 divisors (see below), whose sum is σ = 2031178032. Its totient is φ = 752281920.

The previous prime is 1265140843. The next prime is 1265140909. The reversal of 1265140899 is 9980415621.

1265140899 is a `hidden beast` number, since 126 + 514 + 0 + 8 + 9 + 9 = 666.

It is not a de Polignac number, because 1265140899 - 2¹⁶ = 1265075363 is a prime.

It is a super-4 number, since 4×1265140899⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (1265140819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115312 + ... + 125805.

It is an arithmetic number, because the mean of its divisors is an integer number (84632418).

Almost surely, 2^1265140899 is an apocalyptic number.

1265140899 is a deficient number, since it is larger than the sum of its proper divisors (766037133).

1265140899 is a wasteful number, since it uses less digits than its factorization.

1265140899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241187 (or 241184 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1265140899 is about 35568.8191960318. The cubic root of 1265140899 is about 1081.5492451878.

The spelling of 1265140899 in words is "one billion, two hundred sixty-five million, one hundred forty thousand, eight hundred ninety-nine".