61918345 has 4 divisors (see below), whose sum is σ = 74302020. Its totient is φ = 49534672.

The previous prime is 61918343. The next prime is 61918349. The reversal of 61918345 is 54381916.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33732864 + 28185481 = 5808^2 + 5309^2 .

It is a cyclic number.

It is not a de Polignac number, because 61918345 - 2¹ = 61918343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61918343) 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, 6191830 + ... + 6191839.

It is an arithmetic number, because the mean of its divisors is an integer number (18575505).

Almost surely, 2^61918345 is an apocalyptic number.

It is an amenable number.

61918345 is a deficient number, since it is larger than the sum of its proper divisors (12383675).

61918345 is a wasteful number, since it uses less digits than its factorization.

61918345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12383674.

The product of its digits is 25920, while the sum is 37.

The square root of 61918345 is about 7868.8210679872. The cubic root of 61918345 is about 395.6153310639.

The spelling of 61918345 in words is "sixty-one million, nine hundred eighteen thousand, three hundred forty-five".