2520531991 has 2 divisors, whose sum is σ = 2520531992. Its totient is φ = 2520531990.

The previous prime is 2520531967. The next prime is 2520532061. The reversal of 2520531991 is 1991350252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2520531991 - 2⁷ = 2520531863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2520531991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520531941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260265995 + 1260265996.

It is an arithmetic number, because the mean of its divisors is an integer number (1260265996).

Almost surely, 2^2520531991 is an apocalyptic number.

2520531991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520531991 is an equidigital number, since it uses as much as digits as its factorization.

2520531991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 2520531991 is about 50204.9000696147. The cubic root of 2520531991 is about 1360.9141761294.

The spelling of 2520531991 in words is "two billion, five hundred twenty million, five hundred thirty-one thousand, nine hundred ninety-one".