131222121544 has 16 divisors (see below), whose sum is σ = 246170933820. Its totient is φ = 65576539200.

The previous prime is 131222121539. The next prime is 131222121637. The reversal of 131222121544 is 445121222131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 100893899044 + 30328222500 = 317638^2 + 174150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4299039 + ... + 4329454.

Almost surely, 2^131222121544 is an apocalyptic number.

It is an amenable number.

131222121544 is a deficient number, since it is larger than the sum of its proper divisors (114948812276).

131222121544 is a wasteful number, since it uses less digits than its factorization.

131222121544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8630400 (or 8630396 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

Adding to 131222121544 its reverse (445121222131), we get a palindrome (576343343675).

The spelling of 131222121544 in words is "one hundred thirty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, five hundred forty-four".