61818311 has 4 divisors (see below), whose sum is σ = 61981800. Its totient is φ = 61654824.

The previous prime is 61818271. The next prime is 61818331. The reversal of 61818311 is 11381816.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61818311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61818331) 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, 81176 + ... + 81933.

It is an arithmetic number, because the mean of its divisors is an integer number (15495450).

Almost surely, 2^61818311 is an apocalyptic number.

61818311 is a deficient number, since it is larger than the sum of its proper divisors (163489).

61818311 is a wasteful number, since it uses less digits than its factorization.

61818311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163488.

The product of its digits is 1152, while the sum is 29.

The square root of 61818311 is about 7862.4621461728. The cubic root of 61818311 is about 395.4021669074.

The spelling of 61818311 in words is "sixty-one million, eight hundred eighteen thousand, three hundred eleven".