537121978331 has 2 divisors, whose sum is σ = 537121978332. Its totient is φ = 537121978330.

The previous prime is 537121978307. The next prime is 537121978363. The reversal of 537121978331 is 133879121735.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 537121978331 - 2²⁶ = 537054869467 is a prime.

It is a super-2 number, since 2×537121978331² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 537121978331.

It is not a weakly prime, because it can be changed into another prime (537121978031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268560989165 + 268560989166.

It is an arithmetic number, because the mean of its divisors is an integer number (268560989166).

Almost surely, 2^537121978331 is an apocalyptic number.

537121978331 is a deficient number, since it is larger than the sum of its proper divisors (1).

537121978331 is an equidigital number, since it uses as much as digits as its factorization.

537121978331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 50.

The spelling of 537121978331 in words is "five hundred thirty-seven billion, one hundred twenty-one million, nine hundred seventy-eight thousand, three hundred thirty-one".