25761539 has 2 divisors, whose sum is σ = 25761540. Its totient is φ = 25761538.

The previous prime is 25761517. The next prime is 25761557. The reversal of 25761539 is 93516752.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25761539 - 2¹⁶ = 25696003 is a prime.

It is not a weakly prime, because it can be changed into another prime (25761559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12880769 + 12880770.

It is an arithmetic number, because the mean of its divisors is an integer number (12880770).

Almost surely, 2^25761539 is an apocalyptic number.

25761539 is a deficient number, since it is larger than the sum of its proper divisors (1).

25761539 is an equidigital number, since it uses as much as digits as its factorization.

25761539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 25761539 is about 5075.5826266548. The cubic root of 25761539 is about 295.3411317517.

The spelling of 25761539 in words is "twenty-five million, seven hundred sixty-one thousand, five hundred thirty-nine".