131116428 has 48 divisors (see below), whose sum is σ = 344050560. Its totient is φ = 43175952.

The previous prime is 131116421. The next prime is 131116441. The reversal of 131116428 is 824611131.

It is a happy number.

131116428 is a `hidden beast` number, since 1 + 3 + 1 + 11 + 642 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (131116421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1651 + ... + 16277.

It is an arithmetic number, because the mean of its divisors is an integer number (7167720).

Almost surely, 2^131116428 is an apocalyptic number.

131116428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131116428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172025280).

131116428 is an abundant number, since it is smaller than the sum of its proper divisors (212934132).

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

131116428 is a wasteful number, since it uses less digits than its factorization.

131116428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14723 (or 14715 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 131116428 is about 11450.6081934542. The cubic root of 131116428 is about 508.0257235822.

Adding to 131116428 its reverse (824611131), we get a palindrome (955727559).

The spelling of 131116428 in words is "one hundred thirty-one million, one hundred sixteen thousand, four hundred twenty-eight".