61761811 has 2 divisors, whose sum is σ = 61761812. Its totient is φ = 61761810.

The previous prime is 61761779. The next prime is 61761823. The reversal of 61761811 is 11816716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61761811 - 2⁵ = 61761779 is a prime.

It is not a weakly prime, because it can be changed into another prime (61761881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30880905 + 30880906.

It is an arithmetic number, because the mean of its divisors is an integer number (30880906).

Almost surely, 2^61761811 is an apocalyptic number.

61761811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61761811 is an equidigital number, since it uses as much as digits as its factorization.

61761811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 61761811 is about 7858.8683027520. The cubic root of 61761811 is about 395.2816684573.

The spelling of 61761811 in words is "sixty-one million, seven hundred sixty-one thousand, eight hundred eleven".