61499813 has 4 divisors (see below), whose sum is σ = 61516140. Its totient is φ = 61483488.

The previous prime is 61499803. The next prime is 61499819. The reversal of 61499813 is 31899416.

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 59243809 + 2256004 = 7697^2 + 1502^2 .

It is a cyclic number.

It is not a de Polignac number, because 61499813 - 2⁴ = 61499797 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 (61499819) 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, 683 + ... + 11111.

It is an arithmetic number, because the mean of its divisors is an integer number (15379035).

Almost surely, 2^61499813 is an apocalyptic number.

It is an amenable number.

61499813 is a deficient number, since it is larger than the sum of its proper divisors (16327).

61499813 is a wasteful number, since it uses less digits than its factorization.

61499813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16326.

The product of its digits is 46656, while the sum is 41.

The square root of 61499813 is about 7842.1816479855. The cubic root of 61499813 is about 394.7219385771.

The spelling of 61499813 in words is "sixty-one million, four hundred ninety-nine thousand, eight hundred thirteen".