61161811 has 2 divisors, whose sum is σ = 61161812. Its totient is φ = 61161810.

The previous prime is 61161769. The next prime is 61161823. The reversal of 61161811 is 11816116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61161811 - 2¹⁵ = 61129043 is a prime.

It is not a weakly prime, because it can be changed into another prime (61161511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30580905 + 30580906.

It is an arithmetic number, because the mean of its divisors is an integer number (30580906).

Almost surely, 2^61161811 is an apocalyptic number.

61161811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61161811 is an equidigital number, since it uses as much as digits as its factorization.

61161811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 25.

The square root of 61161811 is about 7820.6017031939. The cubic root of 61161811 is about 393.9974812382.

Adding to 61161811 its reverse (11816116), we get a palindrome (72977927).

The spelling of 61161811 in words is "sixty-one million, one hundred sixty-one thousand, eight hundred eleven".