61820771 has 2 divisors, whose sum is σ = 61820772. Its totient is φ = 61820770.

The previous prime is 61820761. The next prime is 61820777. The reversal of 61820771 is 17702816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61820771 - 2¹⁴ = 61804387 is a prime.

It is not a weakly prime, because it can be changed into another prime (61820777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910385 + 30910386.

It is an arithmetic number, because the mean of its divisors is an integer number (30910386).

Almost surely, 2^61820771 is an apocalyptic number.

61820771 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820771 is an equidigital number, since it uses as much as digits as its factorization.

61820771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 61820771 is about 7862.6185841614. The cubic root of 61820771 is about 395.4074117203.

The spelling of 61820771 in words is "sixty-one million, eight hundred twenty thousand, seven hundred seventy-one".