61538305 has 4 divisors (see below), whose sum is σ = 73845972. Its totient is φ = 49230640.

The previous prime is 61538297. The next prime is 61538333. The reversal of 61538305 is 50383516.

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 47430769 + 14107536 = 6887^2 + 3756^2 .

It is not a de Polignac number, because 61538305 - 2³ = 61538297 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6153826 + ... + 6153835.

It is an arithmetic number, because the mean of its divisors is an integer number (18461493).

It is a Proth number, since it is equal to 939 ⋅ 2¹⁶ + 1 and 939 < 2¹⁶.

Almost surely, 2^61538305 is an apocalyptic number.

It is an amenable number.

61538305 is a deficient number, since it is larger than the sum of its proper divisors (12307667).

61538305 is a wasteful number, since it uses less digits than its factorization.

61538305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12307666.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 61538305 is about 7844.6354281126. The cubic root of 61538305 is about 394.8042719880.

The spelling of 61538305 in words is "sixty-one million, five hundred thirty-eight thousand, three hundred five".