25121689 has 2 divisors, whose sum is σ = 25121690. Its totient is φ = 25121688.

The previous prime is 25121683. The next prime is 25121711. The reversal of 25121689 is 98612152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 8311689 = 4100^2 + 2883^2 .

It is a cyclic number.

It is not a de Polignac number, because 25121689 - 2¹⁷ = 24990617 is a prime.

It is not a weakly prime, because it can be changed into another prime (25121683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560844 + 12560845.

It is an arithmetic number, because the mean of its divisors is an integer number (12560845).

Almost surely, 2^25121689 is an apocalyptic number.

It is an amenable number.

25121689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121689 is an equidigital number, since it uses as much as digits as its factorization.

25121689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 25121689 is about 5012.1541277179. The cubic root of 25121689 is about 292.8754338538.

The spelling of 25121689 in words is "twenty-five million, one hundred twenty-one thousand, six hundred eighty-nine".