61813407 has 8 divisors (see below), whose sum is σ = 83547184. Its totient is φ = 40644288.

The previous prime is 61813399. The next prime is 61813417. The reversal of 61813407 is 70431816.

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 61813407 - 2³ = 61813399 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 (61813417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140908 + ... + 141345.

It is an arithmetic number, because the mean of its divisors is an integer number (10443398).

Almost surely, 2^61813407 is an apocalyptic number.

61813407 is a deficient number, since it is larger than the sum of its proper divisors (21733777).

61813407 is a wasteful number, since it uses less digits than its factorization.

61813407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282329.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 61813407 is about 7862.1502783908. The cubic root of 61813407 is about 395.3917109789.

The spelling of 61813407 in words is "sixty-one million, eight hundred thirteen thousand, four hundred seven".