61810853 has 4 divisors (see below), whose sum is σ = 66565548. Its totient is φ = 57056160.

The previous prime is 61810849. The next prime is 61810871. The reversal of 61810853 is 35801816.

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 5230369 + 56580484 = 2287^2 + 7522^2 .

It is a cyclic number.

It is not a de Polignac number, because 61810853 - 2² = 61810849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61810843) 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, 2377328 + ... + 2377353.

It is an arithmetic number, because the mean of its divisors is an integer number (16641387).

Almost surely, 2^61810853 is an apocalyptic number.

It is an amenable number.

61810853 is a deficient number, since it is larger than the sum of its proper divisors (4754695).

61810853 is a wasteful number, since it uses less digits than its factorization.

61810853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4754694.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 61810853 is about 7861.9878529542. The cubic root of 61810853 is about 395.3862653192.

The spelling of 61810853 in words is "sixty-one million, eight hundred ten thousand, eight hundred fifty-three".