1188250191551 has 4 divisors (see below), whose sum is σ = 1188253892952. Its totient is φ = 1188246490152.

The previous prime is 1188250191523. The next prime is 1188250191559. The reversal of 1188250191551 is 1551910528811.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1188250191551 - 2⁶ = 1188250191487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1188250191496 and 1188250191505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188250191559) 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, 1318061 + ... + 2028246.

It is an arithmetic number, because the mean of its divisors is an integer number (297063473238).

Almost surely, 2^{1188250191551} is an apocalyptic number.

1188250191551 is a deficient number, since it is larger than the sum of its proper divisors (3701401).

1188250191551 is an equidigital number, since it uses as much as digits as its factorization.

1188250191551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701400.

The product of its (nonzero) digits is 144000, while the sum is 47.

The spelling of 1188250191551 in words is "one trillion, one hundred eighty-eight billion, two hundred fifty million, one hundred ninety-one thousand, five hundred fifty-one".