2531491189 has 2 divisors, whose sum is σ = 2531491190. Its totient is φ = 2531491188.

The previous prime is 2531491147. The next prime is 2531491219. The reversal of 2531491189 is 9811941352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2478347089 + 53144100 = 49783^2 + 7290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531491189 - 2⁹ = 2531490677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531491289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265745594 + 1265745595.

It is an arithmetic number, because the mean of its divisors is an integer number (1265745595).

Almost surely, 2^2531491189 is an apocalyptic number.

It is an amenable number.

2531491189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531491189 is an equidigital number, since it uses as much as digits as its factorization.

2531491189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 2531491189 is about 50313.9263922028. The cubic root of 2531491189 is about 1362.8837291258.

The spelling of 2531491189 in words is "two billion, five hundred thirty-one million, four hundred ninety-one thousand, one hundred eighty-nine".