61819811 has 4 divisors (see below), whose sum is σ = 62564712. Its totient is φ = 61074912.

The previous prime is 61819801. The next prime is 61819819. The reversal of 61819811 is 11891816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61819811 - 2²² = 57625507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61819819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372326 + ... + 372491.

It is an arithmetic number, because the mean of its divisors is an integer number (15641178).

Almost surely, 2^61819811 is an apocalyptic number.

61819811 is a deficient number, since it is larger than the sum of its proper divisors (744901).

61819811 is an equidigital number, since it uses as much as digits as its factorization.

61819811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744900.

The product of its digits is 3456, while the sum is 35.

The square root of 61819811 is about 7862.5575355606. The cubic root of 61819811 is about 395.4053649806.

The spelling of 61819811 in words is "sixty-one million, eight hundred nineteen thousand, eight hundred eleven".