61771783 has 2 divisors, whose sum is σ = 61771784. Its totient is φ = 61771782.

The previous prime is 61771781. The next prime is 61771799. The reversal of 61771783 is 38717716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61771783 - 2¹ = 61771781 is a prime.

Together with 61771781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885891 + 30885892.

It is an arithmetic number, because the mean of its divisors is an integer number (30885892).

Almost surely, 2^61771783 is an apocalyptic number.

61771783 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771783 is an equidigital number, since it uses as much as digits as its factorization.

61771783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 61771783 is about 7859.5027196382. The cubic root of 61771783 is about 395.3029412396.

The spelling of 61771783 in words is "sixty-one million, seven hundred seventy-one thousand, seven hundred eighty-three".