61945771 has 2 divisors, whose sum is σ = 61945772. Its totient is φ = 61945770.

The previous prime is 61945759. The next prime is 61945777. The reversal of 61945771 is 17754916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61945771 - 2¹⁵ = 61913003 is a prime.

It is not a weakly prime, because it can be changed into another prime (61945777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30972885 + 30972886.

It is an arithmetic number, because the mean of its divisors is an integer number (30972886).

Almost surely, 2^61945771 is an apocalyptic number.

61945771 is a deficient number, since it is larger than the sum of its proper divisors (1).

61945771 is an equidigital number, since it uses as much as digits as its factorization.

61945771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 61945771 is about 7870.5635757549. The cubic root of 61945771 is about 395.6737334888.

The spelling of 61945771 in words is "sixty-one million, nine hundred forty-five thousand, seven hundred seventy-one".