2491251533 has 2 divisors, whose sum is σ = 2491251534. Its totient is φ = 2491251532.

The previous prime is 2491251487. The next prime is 2491251619. The reversal of 2491251533 is 3351521942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2342850409 + 148401124 = 48403^2 + 12182^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491251533 - 2²⁸ = 2222816077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2491251493 and 2491251502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491251733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245625766 + 1245625767.

It is an arithmetic number, because the mean of its divisors is an integer number (1245625767).

Almost surely, 2^2491251533 is an apocalyptic number.

It is an amenable number.

2491251533 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491251533 is an equidigital number, since it uses as much as digits as its factorization.

2491251533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 2491251533 is about 49912.4386601176. The cubic root of 2491251533 is about 1355.6238251713.

The spelling of 2491251533 in words is "two billion, four hundred ninety-one million, two hundred fifty-one thousand, five hundred thirty-three".