25690993 has 2 divisors, whose sum is σ = 25690994. Its totient is φ = 25690992.

The previous prime is 25690991. The next prime is 25690997. The reversal of 25690993 is 39909652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25070049 + 620944 = 5007^2 + 788^2 .

It is a cyclic number.

It is not a de Polignac number, because 25690993 - 2¹ = 25690991 is a prime.

It is a super-5 number, since 5×25690993⁵ (a number of 38 digits) contains 55555 as substring.

Together with 25690991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25690991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12845496 + 12845497.

It is an arithmetic number, because the mean of its divisors is an integer number (12845497).

Almost surely, 2^25690993 is an apocalyptic number.

It is an amenable number.

25690993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25690993 is an equidigital number, since it uses as much as digits as its factorization.

25690993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 25690993 is about 5068.6283154321. The cubic root of 25690993 is about 295.0712956090.

The spelling of 25690993 in words is "twenty-five million, six hundred ninety thousand, nine hundred ninety-three".