61857893 has 2 divisors, whose sum is σ = 61857894. Its totient is φ = 61857892.

The previous prime is 61857871. The next prime is 61857911. The reversal of 61857893 is 39875816.

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., 40170244 + 21687649 = 6338^2 + 4657^2 .

It is a cyclic number.

It is not a de Polignac number, because 61857893 - 2⁸ = 61857637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61857823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30928946 + 30928947.

It is an arithmetic number, because the mean of its divisors is an integer number (30928947).

Almost surely, 2^61857893 is an apocalyptic number.

It is an amenable number.

61857893 is a deficient number, since it is larger than the sum of its proper divisors (1).

61857893 is an equidigital number, since it uses as much as digits as its factorization.

61857893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 61857893 is about 7864.9788938051. The cubic root of 61857893 is about 395.4865403404.

The spelling of 61857893 in words is "sixty-one million, eight hundred fifty-seven thousand, eight hundred ninety-three".