25519993 has 2 divisors, whose sum is σ = 25519994. Its totient is φ = 25519992.

The previous prime is 25519981. The next prime is 25520003. The reversal of 25519993 is 39991552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22534009 + 2985984 = 4747^2 + 1728^2 .

It is a cyclic number.

It is not a de Polignac number, because 25519993 - 2⁵ = 25519961 is a prime.

It is not a weakly prime, because it can be changed into another prime (25519933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759996 + 12759997.

It is an arithmetic number, because the mean of its divisors is an integer number (12759997).

Almost surely, 2^25519993 is an apocalyptic number.

It is an amenable number.

25519993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25519993 is an equidigital number, since it uses as much as digits as its factorization.

25519993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109350, while the sum is 43.

The square root of 25519993 is about 5051.7316832944. The cubic root of 25519993 is about 294.4151699967.

It can be divided in two parts, 2551 and 9993, that added together give a square (12544 = 112²).

The spelling of 25519993 in words is "twenty-five million, five hundred nineteen thousand, nine hundred ninety-three".