2538550991 has 2 divisors, whose sum is σ = 2538550992. Its totient is φ = 2538550990.

The previous prime is 2538550979. The next prime is 2538550997. The reversal of 2538550991 is 1990558352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2538550991 - 2²² = 2534356687 is a prime.

It is a super-2 number, since 2×2538550991² = 12888482267814164162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2538550997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269275495 + 1269275496.

It is an arithmetic number, because the mean of its divisors is an integer number (1269275496).

Almost surely, 2^2538550991 is an apocalyptic number.

2538550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2538550991 is an equidigital number, since it uses as much as digits as its factorization.

2538550991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 2538550991 is about 50384.0350805689. The cubic root of 2538550991 is about 1364.1494862224.

The spelling of 2538550991 in words is "two billion, five hundred thirty-eight million, five hundred fifty thousand, nine hundred ninety-one".