25981793 has 2 divisors, whose sum is σ = 25981794. Its totient is φ = 25981792.

The previous prime is 25981783. The next prime is 25981799. The reversal of 25981793 is 39718952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24373969 + 1607824 = 4937^2 + 1268^2 .

It is a cyclic number.

It is not a de Polignac number, because 25981793 - 2⁴ = 25981777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25981799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990896 + 12990897.

It is an arithmetic number, because the mean of its divisors is an integer number (12990897).

Almost surely, 2^25981793 is an apocalyptic number.

It is an amenable number.

25981793 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981793 is an equidigital number, since it uses as much as digits as its factorization.

25981793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 25981793 is about 5097.2338576918. The cubic root of 25981793 is about 296.1804391981.

The spelling of 25981793 in words is "twenty-five million, nine hundred eighty-one thousand, seven hundred ninety-three".