61809343 has 4 divisors (see below), whose sum is σ = 62503920. Its totient is φ = 61114768.

The previous prime is 61809323. The next prime is 61809347. The reversal of 61809343 is 34390816.

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

It is a cyclic number.

It is not a de Polignac number, because 61809343 - 2¹³ = 61801151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61809299 and 61809308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61809347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347155 + ... + 347332.

It is an arithmetic number, because the mean of its divisors is an integer number (15625980).

Almost surely, 2^61809343 is an apocalyptic number.

61809343 is a deficient number, since it is larger than the sum of its proper divisors (694577).

61809343 is an equidigital number, since it uses as much as digits as its factorization.

61809343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694576.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 61809343 is about 7861.8918206752. The cubic root of 61809343 is about 395.3830456143.

The spelling of 61809343 in words is "sixty-one million, eight hundred nine thousand, three hundred forty-three".