61609811 has 2 divisors, whose sum is σ = 61609812. Its totient is φ = 61609810.

The previous prime is 61609781. The next prime is 61609829. The reversal of 61609811 is 11890616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61609811 - 2²² = 57415507 is a prime.

It is a super-2 number, since 2×61609811² = 7591537622911442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61609871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30804905 + 30804906.

It is an arithmetic number, because the mean of its divisors is an integer number (30804906).

Almost surely, 2^61609811 is an apocalyptic number.

61609811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61609811 is an equidigital number, since it uses as much as digits as its factorization.

61609811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 61609811 is about 7849.1917418292. The cubic root of 61609811 is about 394.9571304220.

The spelling of 61609811 in words is "sixty-one million, six hundred nine thousand, eight hundred eleven".