1265377281 has 16 divisors (see below), whose sum is σ = 1931359104. Its totient is φ = 721885824.

The previous prime is 1265377261. The next prime is 1265377363. The reversal of 1265377281 is 1827735621.

It is not a de Polignac number, because 1265377281 - 2⁵ = 1265377249 is a prime.

It is a super-2 number, since 2×1265377281² = 3202359326541905922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265377241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36276 + ... + 62021.

It is an arithmetic number, because the mean of its divisors is an integer number (120709944).

Almost surely, 2^1265377281 is an apocalyptic number.

It is an amenable number.

1265377281 is a deficient number, since it is larger than the sum of its proper divisors (665981823).

1265377281 is an equidigital number, since it uses as much as digits as its factorization.

1265377281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98920.

The product of its digits is 141120, while the sum is 42.

The square root of 1265377281 is about 35572.1419231398. The cubic root of 1265377281 is about 1081.6166007561.

The spelling of 1265377281 in words is "one billion, two hundred sixty-five million, three hundred seventy-seven thousand, two hundred eighty-one".