25978129 has 2 divisors, whose sum is σ = 25978130. Its totient is φ = 25978128.

The previous prime is 25978103. The next prime is 25978153. The reversal of 25978129 is 92187952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 425104 = 5055^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 25978129 - 2⁵ = 25978097 is a prime.

It is not a weakly prime, because it can be changed into another prime (25970129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989064 + 12989065.

It is an arithmetic number, because the mean of its divisors is an integer number (12989065).

Almost surely, 2^25978129 is an apocalyptic number.

It is an amenable number.

25978129 is a deficient number, since it is larger than the sum of its proper divisors (1).

25978129 is an equidigital number, since it uses as much as digits as its factorization.

25978129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 25978129 is about 5096.8744343960. The cubic root of 25978129 is about 296.1665159078.

The spelling of 25978129 in words is "twenty-five million, nine hundred seventy-eight thousand, one hundred twenty-nine".