61868513 has 8 divisors (see below), whose sum is σ = 73145280. Its totient is φ = 51201360.

The previous prime is 61868507. The next prime is 61868531. The reversal of 61868513 is 31586816.

It is a happy number.

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

It is not a de Polignac number, because 61868513 - 2²² = 57674209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61868533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152183 + ... + 152588.

It is an arithmetic number, because the mean of its divisors is an integer number (9143160).

Almost surely, 2^61868513 is an apocalyptic number.

It is an amenable number.

61868513 is a deficient number, since it is larger than the sum of its proper divisors (11276767).

61868513 is a wasteful number, since it uses less digits than its factorization.

61868513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304807.

The product of its digits is 34560, while the sum is 38.

The square root of 61868513 is about 7865.6540096803. The cubic root of 61868513 is about 395.5091719267.

The spelling of 61868513 in words is "sixty-one million, eight hundred sixty-eight thousand, five hundred thirteen".