61820293 has 4 divisors (see below), whose sum is σ = 63814528. Its totient is φ = 59826060.

The previous prime is 61820273. The next prime is 61820321. The reversal of 61820293 is 39202816.

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 61820293 - 2⁹ = 61819781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1994203 = 61820293 / (6 + 1 + 8 + 2 + 0 + 2 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820233) 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, 997071 + ... + 997132.

It is an arithmetic number, because the mean of its divisors is an integer number (15953632).

Almost surely, 2^61820293 is an apocalyptic number.

It is an amenable number.

61820293 is a deficient number, since it is larger than the sum of its proper divisors (1994235).

61820293 is a wasteful number, since it uses less digits than its factorization.

61820293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994234.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61820293 is about 7862.5881871048. The cubic root of 61820293 is about 395.4063926171.

The spelling of 61820293 in words is "sixty-one million, eight hundred twenty thousand, two hundred ninety-three".