61864877 has 2 divisors, whose sum is σ = 61864878. Its totient is φ = 61864876.

The previous prime is 61864867. The next prime is 61864909. The reversal of 61864877 is 77846816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44342281 + 17522596 = 6659^2 + 4186^2 .

It is a cyclic number.

It is not a de Polignac number, because 61864877 - 2⁴ = 61864861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61864837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932438 + 30932439.

It is an arithmetic number, because the mean of its divisors is an integer number (30932439).

Almost surely, 2^61864877 is an apocalyptic number.

It is an amenable number.

61864877 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864877 is an equidigital number, since it uses as much as digits as its factorization.

61864877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 61864877 is about 7865.4228748364. The cubic root of 61864877 is about 395.5014237769.

The spelling of 61864877 in words is "sixty-one million, eight hundred sixty-four thousand, eight hundred seventy-seven".