61147813 has 4 divisors (see below), whose sum is σ = 61164108. Its totient is φ = 61131520.

The previous prime is 61147811. The next prime is 61147829. The reversal of 61147813 is 31874116.

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 33616804 + 27531009 = 5798^2 + 5247^2 .

It is a cyclic number.

It is not a de Polignac number, because 61147813 - 2¹ = 61147811 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61147811) 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, 645 + ... + 11077.

It is an arithmetic number, because the mean of its divisors is an integer number (15291027).

Almost surely, 2^61147813 is an apocalyptic number.

It is an amenable number.

61147813 is a deficient number, since it is larger than the sum of its proper divisors (16295).

61147813 is a wasteful number, since it uses less digits than its factorization.

61147813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294.

The product of its digits is 4032, while the sum is 31.

The square root of 61147813 is about 7819.7067080550. The cubic root of 61147813 is about 393.9674210997.

The spelling of 61147813 in words is "sixty-one million, one hundred forty-seven thousand, eight hundred thirteen".