25781069 has 2 divisors, whose sum is σ = 25781070. Its totient is φ = 25781068.

The previous prime is 25781033. The next prime is 25781083. The reversal of 25781069 is 96018752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14478025 + 11303044 = 3805^2 + 3362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25781069 is a prime.

It is a super-2 number, since 2×25781069² = 1329327037565522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25781089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12890534 + 12890535.

It is an arithmetic number, because the mean of its divisors is an integer number (12890535).

Almost surely, 2^25781069 is an apocalyptic number.

It is an amenable number.

25781069 is a deficient number, since it is larger than the sum of its proper divisors (1).

25781069 is an equidigital number, since it uses as much as digits as its factorization.

25781069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 25781069 is about 5077.5061792183. The cubic root of 25781069 is about 295.4157462811.

The spelling of 25781069 in words is "twenty-five million, seven hundred eighty-one thousand, sixty-nine".