61813499 has 8 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 56141800.

The previous prime is 61813481. The next prime is 61813501. The reversal of 61813499 is 99431816.

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

It is not a de Polignac number, because 61813499 - 2¹⁶ = 61747963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61813429) 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, 14762 + ... + 18480.

It is an arithmetic number, because the mean of its divisors is an integer number (8436960).

Almost surely, 2^61813499 is an apocalyptic number.

61813499 is a deficient number, since it is larger than the sum of its proper divisors (5682181).

61813499 is a wasteful number, since it uses less digits than its factorization.

61813499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241.

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

The square root of 61813499 is about 7862.1561292053. The cubic root of 61813499 is about 395.3919071393.

The spelling of 61813499 in words is "sixty-one million, eight hundred thirteen thousand, four hundred ninety-nine".