7521313133131 has 4 divisors (see below), whose sum is σ = 8595786437872. Its totient is φ = 6446839828392.

The previous prime is 7521313133123. The next prime is 7521313133171. The reversal of 7521313133131 is 1313313131257.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7521313133131 - 2³ = 7521313133123 is a prime.

It is a super-2 number, since 2×7521313133131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7521313133171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537236652360 + ... + 537236652373.

It is an arithmetic number, because the mean of its divisors is an integer number (2148946609468).

Almost surely, 2^{7521313133131} is an apocalyptic number.

7521313133131 is a deficient number, since it is larger than the sum of its proper divisors (1074473304741).

7521313133131 is a wasteful number, since it uses less digits than its factorization.

7521313133131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074473304740.

The product of its digits is 17010, while the sum is 34.

Adding to 7521313133131 its reverse (1313313131257), we get a palindrome (8834626264388).

The spelling of 7521313133131 in words is "seven trillion, five hundred twenty-one billion, three hundred thirteen million, one hundred thirty-three thousand, one hundred thirty-one".