1265571 has 16 divisors (see below), whose sum is σ = 1974400. Its totient is φ = 798984.

The previous prime is 1265557. The next prime is 1265573. The reversal of 1265571 is 1755621.

1265571 is a `hidden beast` number, since 1 + 2 + 655 + 7 + 1 = 666.

It is not a de Polignac number, because 1265571 - 2⁷ = 1265443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265573) 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, 721 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (123400).

2^1265571 is an apocalyptic number.

1265571 is a deficient number, since it is larger than the sum of its proper divisors (708829).

1265571 is a wasteful number, since it uses less digits than its factorization.

1265571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495 (or 2489 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 1265571 is about 1124.9759997440. The cubic root of 1265571 is about 108.1671793516.

The spelling of 1265571 in words is "one million, two hundred sixty-five thousand, five hundred seventy-one".