1265142281 has 12 divisors (see below), whose sum is σ = 1371182400. Its totient is φ = 1166770800.

The previous prime is 1265142223. The next prime is 1265142283. The reversal of 1265142281 is 1822415621.

It is a de Polignac number, because none of the positive numbers 2^k-1265142281 is a prime.

It is a super-2 number, since 2×1265142281² = 3201169982347765922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265142283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233756 + ... + 239106.

It is an arithmetic number, because the mean of its divisors is an integer number (114265200).

Almost surely, 2^1265142281 is an apocalyptic number.

It is an amenable number.

1265142281 is a deficient number, since it is larger than the sum of its proper divisors (106040119).

1265142281 is a wasteful number, since it uses less digits than its factorization.

1265142281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6776 (or 6763 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 1265142281 is about 35568.8386231544. The cubic root of 1265142281 is about 1081.5496390044.

The spelling of 1265142281 in words is "one billion, two hundred sixty-five million, one hundred forty-two thousand, two hundred eighty-one".