11531381490 has 96 divisors (see below), whose sum is σ = 30563363376. Its totient is φ = 3015843840.

The previous prime is 11531381479. The next prime is 11531381507. The reversal of 11531381490 is 9418313511.

It is a happy number.

11531381490 is a `hidden beast` number, since 1 + 1 + 531 + 3 + 81 + 49 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 437604561 + 11093776929 = 20919^2 + 105327^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1184322 + ... + 1194018.

Almost surely, 2^11531381490 is an apocalyptic number.

11531381490 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 11531381490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15281681688).

11531381490 is an abundant number, since it is smaller than the sum of its proper divisors (19031981886).

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

11531381490 is a wasteful number, since it uses less digits than its factorization.

11531381490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9964 (or 9961 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 11531381490 in words is "eleven billion, five hundred thirty-one million, three hundred eighty-one thousand, four hundred ninety".