825261581 has 2 divisors, whose sum is σ = 825261582. Its totient is φ = 825261580.

The previous prime is 825261533. The next prime is 825261587. The reversal of 825261581 is 185162528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746655625 + 78605956 = 27325^2 + 8866^2 .

It is a cyclic number.

It is not a de Polignac number, because 825261581 - 2⁶ = 825261517 is a prime.

It is a super-2 number, since 2×825261581² = 1362113354149239122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825261587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412630790 + 412630791.

It is an arithmetic number, because the mean of its divisors is an integer number (412630791).

Almost surely, 2^825261581 is an apocalyptic number.

It is an amenable number.

825261581 is a deficient number, since it is larger than the sum of its proper divisors (1).

825261581 is an equidigital number, since it uses as much as digits as its factorization.

825261581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 38.

The square root of 825261581 is about 28727.3664125342. The cubic root of 825261581 is about 937.9878420053.

The spelling of 825261581 in words is "eight hundred twenty-five million, two hundred sixty-one thousand, five hundred eighty-one".