25702921 has 2 divisors, whose sum is σ = 25702922. Its totient is φ = 25702920.

The previous prime is 25702913. The next prime is 25702927. The reversal of 25702921 is 12920752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23629321 + 2073600 = 4861^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 25702921 - 2³ = 25702913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25702921.

It is not a weakly prime, because it can be changed into another prime (25702927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12851460 + 12851461.

It is an arithmetic number, because the mean of its divisors is an integer number (12851461).

Almost surely, 2^25702921 is an apocalyptic number.

It is an amenable number.

25702921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25702921 is an equidigital number, since it uses as much as digits as its factorization.

25702921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 25702921 is about 5069.8048285905. The cubic root of 25702921 is about 295.1169544884.

The spelling of 25702921 in words is "twenty-five million, seven hundred two thousand, nine hundred twenty-one".