1187494253 has 4 divisors (see below), whose sum is σ = 1295448288. Its totient is φ = 1079540220.

The previous prime is 1187494247. The next prime is 1187494261. The reversal of 1187494253 is 3524947811.

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 not a de Polignac number, because 1187494253 - 2²⁰ = 1186445677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187494223) 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, 53977001 + ... + 53977022.

It is an arithmetic number, because the mean of its divisors is an integer number (323862072).

Almost surely, 2^1187494253 is an apocalyptic number.

It is an amenable number.

1187494253 is a deficient number, since it is larger than the sum of its proper divisors (107954035).

1187494253 is a wasteful number, since it uses less digits than its factorization.

1187494253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107954034.

The product of its digits is 241920, while the sum is 44.

The square root of 1187494253 is about 34460.0384938845. The cubic root of 1187494253 is about 1058.9541877607.

The spelling of 1187494253 in words is "one billion, one hundred eighty-seven million, four hundred ninety-four thousand, two hundred fifty-three".