25801949 has 2 divisors, whose sum is σ = 25801950. Its totient is φ = 25801948.

The previous prime is 25801933. The next prime is 25801973. The reversal of 25801949 is 94910852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24552025 + 1249924 = 4955^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 25801949 - 2⁴ = 25801933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25801049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12900974 + 12900975.

It is an arithmetic number, because the mean of its divisors is an integer number (12900975).

Almost surely, 2^25801949 is an apocalyptic number.

It is an amenable number.

25801949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25801949 is an equidigital number, since it uses as much as digits as its factorization.

25801949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 25801949 is about 5079.5618905571. The cubic root of 25801949 is about 295.4954768295.

The spelling of 25801949 in words is "twenty-five million, eight hundred one thousand, nine hundred forty-nine".