1265211453 has 24 divisors (see below), whose sum is σ = 1865060064. Its totient is φ = 762324640.

The previous prime is 1265211443. The next prime is 1265211461. The reversal of 1265211453 is 3541125621.

It is not a de Polignac number, because 1265211453 - 2¹⁴ = 1265195069 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1265211453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265211443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52726 + ... + 72872.

It is an arithmetic number, because the mean of its divisors is an integer number (77710836).

Almost surely, 2^1265211453 is an apocalyptic number.

It is an amenable number.

1265211453 is a deficient number, since it is larger than the sum of its proper divisors (599848611).

1265211453 is a wasteful number, since it uses less digits than its factorization.

1265211453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20345 (or 20334 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1265211453 is about 35569.8109778503. The cubic root of 1265211453 is about 1081.5693499859.

The spelling of 1265211453 in words is "one billion, two hundred sixty-five million, two hundred eleven thousand, four hundred fifty-three".