131121616 has 10 divisors (see below), whose sum is σ = 254048162. Its totient is φ = 65560800.

The previous prime is 131121611. The next prime is 131121637. The reversal of 131121616 is 616121131.

It can be written as a sum of positive squares in only one way, i.e., 104040000 + 27081616 = 10200^2 + 5204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4097535 + ... + 4097566.

Almost surely, 2^131121616 is an apocalyptic number.

131121616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131121616 is a deficient number, since it is larger than the sum of its proper divisors (122926546).

131121616 is an equidigital number, since it uses as much as digits as its factorization.

131121616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8195109 (or 8195103 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 131121616 is about 11450.8347293986. The cubic root of 131121616 is about 508.0324239953.

Adding to 131121616 its reverse (616121131), we get a palindrome (747242747).

The spelling of 131121616 in words is "one hundred thirty-one million, one hundred twenty-one thousand, six hundred sixteen".