1131401550 has 48 divisors (see below), whose sum is σ = 2953560960. Its totient is φ = 285827040.

The previous prime is 1131401549. The next prime is 1131401573. The reversal of 1131401550 is 551041311.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195642 + ... + 201341.

It is an arithmetic number, because the mean of its divisors is an integer number (61532520).

Almost surely, 2^1131401550 is an apocalyptic number.

1131401550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1131401550 is an abundant number, since it is smaller than the sum of its proper divisors (1822159410).

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

1131401550 is a wasteful number, since it uses less digits than its factorization.

1131401550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397017 (or 397012 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1131401550 is about 33636.3129667923. The cubic root of 1131401550 is about 1042.0108868439.

Adding to 1131401550 its reverse (551041311), we get a palindrome (1682442861).

The spelling of 1131401550 in words is "one billion, one hundred thirty-one million, four hundred one thousand, five hundred fifty".