61812305 has 4 divisors (see below), whose sum is σ = 74174772. Its totient is φ = 49449840.

The previous prime is 61812299. The next prime is 61812307. The reversal of 61812305 is 50321816.

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 10029889 + 51782416 = 3167^2 + 7196^2 .

It is not a de Polignac number, because 61812305 - 2⁶ = 61812241 is a prime.

It is a super-2 number, since 2×61812305² = 7641522098826050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61812307) 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, 6181226 + ... + 6181235.

It is an arithmetic number, because the mean of its divisors is an integer number (18543693).

Almost surely, 2^61812305 is an apocalyptic number.

It is an amenable number.

61812305 is a deficient number, since it is larger than the sum of its proper divisors (12362467).

61812305 is a wasteful number, since it uses less digits than its factorization.

61812305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12362466.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 61812305 is about 7862.0801954699. The cubic root of 61812305 is about 395.3893613039.

The spelling of 61812305 in words is "sixty-one million, eight hundred twelve thousand, three hundred five".