61311823 has 2 divisors, whose sum is σ = 61311824. Its totient is φ = 61311822.

The previous prime is 61311791. The next prime is 61311863. The reversal of 61311823 is 32811316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61311823 - 2⁵ = 61311791 is a prime.

It is equal to p_3635305 and since 61311823 and 3635305 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61311863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655911 + 30655912.

It is an arithmetic number, because the mean of its divisors is an integer number (30655912).

Almost surely, 2^61311823 is an apocalyptic number.

61311823 is a deficient number, since it is larger than the sum of its proper divisors (1).

61311823 is an equidigital number, since it uses as much as digits as its factorization.

61311823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 61311823 is about 7830.1866516706. The cubic root of 61311823 is about 394.3193383636.

The spelling of 61311823 in words is "sixty-one million, three hundred eleven thousand, eight hundred twenty-three".