61805245 has 8 divisors (see below), whose sum is σ = 75975480. Its totient is φ = 48238080.

The previous prime is 61805243. The next prime is 61805267. The reversal of 61805245 is 54250816.

It can be written as a sum of positive squares in 4 ways, for example, as 1012036 + 60793209 = 1006^2 + 7797^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61805245 - 2¹ = 61805243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61805243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150540 + ... + 150949.

It is an arithmetic number, because the mean of its divisors is an integer number (9496935).

Almost surely, 2^61805245 is an apocalyptic number.

It is an amenable number.

61805245 is a deficient number, since it is larger than the sum of its proper divisors (14170235).

61805245 is a wasteful number, since it uses less digits than its factorization.

61805245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301535.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 61805245 is about 7861.6311920619. The cubic root of 61805245 is about 395.3743073694.

The spelling of 61805245 in words is "sixty-one million, eight hundred five thousand, two hundred forty-five".