61812813 has 8 divisors (see below), whose sum is σ = 83578176. Its totient is φ = 40628000.

The previous prime is 61812797. The next prime is 61812841. The reversal of 61812813 is 31821816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61812813 - 2⁴ = 61812797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61812613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144888 + ... + 145313.

It is an arithmetic number, because the mean of its divisors is an integer number (10447272).

Almost surely, 2^61812813 is an apocalyptic number.

It is an amenable number.

61812813 is a deficient number, since it is larger than the sum of its proper divisors (21765363).

61812813 is a wasteful number, since it uses less digits than its factorization.

61812813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290275.

The product of its digits is 2304, while the sum is 30.

The square root of 61812813 is about 7862.1125023749. The cubic root of 61812813 is about 395.3904444607.

It can be divided in two parts, 618 and 12813, that added together give a palindrome (13431).

The spelling of 61812813 in words is "sixty-one million, eight hundred twelve thousand, eight hundred thirteen".