1187265853 has 4 divisors (see below), whose sum is σ = 1187383648. Its totient is φ = 1187148060.

The previous prime is 1187265851. The next prime is 1187265857. The reversal of 1187265853 is 3585627811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1187265853 - 2¹ = 1187265851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187265851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42201 + ... + 64462.

It is an arithmetic number, because the mean of its divisors is an integer number (296845912).

Almost surely, 2^1187265853 is an apocalyptic number.

It is an amenable number.

1187265853 is a deficient number, since it is larger than the sum of its proper divisors (117795).

1187265853 is a wasteful number, since it uses less digits than its factorization.

1187265853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117794.

The product of its digits is 403200, while the sum is 46.

The square root of 1187265853 is about 34456.7243509884. The cubic root of 1187265853 is about 1058.8862911108.

The spelling of 1187265853 in words is "one billion, one hundred eighty-seven million, two hundred sixty-five thousand, eight hundred fifty-three".