1187622553 has 4 divisors (see below), whose sum is σ = 1278978148. Its totient is φ = 1096266960.

The previous prime is 1187622521. The next prime is 1187622571. The reversal of 1187622553 is 3552267811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 755315289 + 432307264 = 27483^2 + 20792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187622553 - 2⁵ = 1187622521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187625553) 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, 45677778 + ... + 45677803.

It is an arithmetic number, because the mean of its divisors is an integer number (319744537).

Almost surely, 2^1187622553 is an apocalyptic number.

1187622553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1187622553 is a deficient number, since it is larger than the sum of its proper divisors (91355595).

1187622553 is an equidigital number, since it uses as much as digits as its factorization.

1187622553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91355594.

The product of its digits is 100800, while the sum is 40.

The square root of 1187622553 is about 34461.9000201672. The cubic root of 1187622553 is about 1058.9923237852.

The spelling of 1187622553 in words is "one billion, one hundred eighty-seven million, six hundred twenty-two thousand, five hundred fifty-three".