40025261 has 2 divisors, whose sum is σ = 40025262. Its totient is φ = 40025260.

The previous prime is 40025239. The next prime is 40025263. The reversal of 40025261 is 16252004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 649636 = 6275^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 40025261 - 2¹⁸ = 39763117 is a prime.

Together with 40025263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40025263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20012630 + 20012631.

It is an arithmetic number, because the mean of its divisors is an integer number (20012631).

Almost surely, 2^40025261 is an apocalyptic number.

It is an amenable number.

40025261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40025261 is an equidigital number, since it uses as much as digits as its factorization.

40025261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40025261 is about 6326.5520625377. The cubic root of 40025261 is about 342.0671670229.

Adding to 40025261 its reverse (16252004), we get a palindrome (56277265).

The spelling of 40025261 in words is "forty million, twenty-five thousand, two hundred sixty-one".