1131025400550 has 120 divisors (see below), whose sum is σ = 3143018174736. Its totient is φ = 301564244160.

The previous prime is 1131025400497. The next prime is 1131025400569. The reversal of 1131025400550 is 550045201311.

1131025400550 is a `hidden beast` number, since 1 + 1 + 3 + 102 + 5 + 4 + 0 + 0 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 37556799 + ... + 37586901.

Almost surely, 2^{1131025400550} is an apocalyptic number.

1131025400550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131025400550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1571509087368).

1131025400550 is an abundant number, since it is smaller than the sum of its proper divisors (2011992774186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131025400550 is a wasteful number, since it uses less digits than its factorization.

1131025400550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39404 (or 39390 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 1131025400550 in words is "one trillion, one hundred thirty-one billion, twenty-five million, four hundred thousand, five hundred fifty".