61578343 has 2 divisors, whose sum is σ = 61578344. Its totient is φ = 61578342.

The previous prime is 61578317. The next prime is 61578389. The reversal of 61578343 is 34387516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61578343 - 2¹⁷ = 61447271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61578043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30789171 + 30789172.

It is an arithmetic number, because the mean of its divisors is an integer number (30789172).

Almost surely, 2^61578343 is an apocalyptic number.

61578343 is a deficient number, since it is larger than the sum of its proper divisors (1).

61578343 is an equidigital number, since it uses as much as digits as its factorization.

61578343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 61578343 is about 7847.1869482000. The cubic root of 61578343 is about 394.8898758328.

The spelling of 61578343 in words is "sixty-one million, five hundred seventy-eight thousand, three hundred forty-three".