25047997 has 10 divisors (see below), whose sum is σ = 27166198. Its totient is φ = 23094864.

The previous prime is 25047961. The next prime is 25048033. The reversal of 25047997 is 79974052.

It is an interprime number because it is at equal distance from previous prime (25047961) and next prime (25048033).

It can be written as a sum of positive squares in 5 ways, for example, as 17397241 + 7650756 = 4171^2 + 2766^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25047997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25041997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28123 + ... + 28999.

Almost surely, 2^25047997 is an apocalyptic number.

It is an amenable number.

25047997 is a deficient number, since it is larger than the sum of its proper divisors (2118201).

25047997 is an frugal number, since it uses more digits than its factorization.

25047997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 25047997 is about 5004.7973984968. The cubic root of 25047997 is about 292.5887796352.

It can be divided in two parts, 2504 and 7997, that added together give a palindrome (10501).

The spelling of 25047997 in words is "twenty-five million, forty-seven thousand, nine hundred ninety-seven".