61641611 has 2 divisors, whose sum is σ = 61641612. Its totient is φ = 61641610.

The previous prime is 61641589. The next prime is 61641637. The reversal of 61641611 is 11614616.

It is an a-pointer prime, because the next prime (61641637) can be obtained adding 61641611 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61641611 is a prime.

It is not a weakly prime, because it can be changed into another prime (61641011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30820805 + 30820806.

It is an arithmetic number, because the mean of its divisors is an integer number (30820806).

Almost surely, 2^61641611 is an apocalyptic number.

61641611 is a deficient number, since it is larger than the sum of its proper divisors (1).

61641611 is an equidigital number, since it uses as much as digits as its factorization.

61641611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 61641611 is about 7851.2171667838. The cubic root of 61641611 is about 395.0250713136.

The spelling of 61641611 in words is "sixty-one million, six hundred forty-one thousand, six hundred eleven".