61812393 has 4 divisors (see below), whose sum is σ = 82416528. Its totient is φ = 41208260.

The previous prime is 61812383. The next prime is 61812397. The reversal of 61812393 is 39321816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61812393 - 2⁶ = 61812329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61812397) 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, 10302063 + ... + 10302068.

It is an arithmetic number, because the mean of its divisors is an integer number (20604132).

Almost surely, 2^61812393 is an apocalyptic number.

It is an amenable number.

61812393 is a deficient number, since it is larger than the sum of its proper divisors (20604135).

61812393 is a wasteful number, since it uses less digits than its factorization.

61812393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20604134.

The product of its digits is 7776, while the sum is 33.

The square root of 61812393 is about 7862.0857919511. The cubic root of 61812393 is about 395.3895489378.

The spelling of 61812393 in words is "sixty-one million, eight hundred twelve thousand, three hundred ninety-three".