61478913 has 4 divisors (see below), whose sum is σ = 81971888. Its totient is φ = 40985940.

The previous prime is 61478881. The next prime is 61478917. The reversal of 61478913 is 31987416.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61478913 - 2⁵ = 61478881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61478917) 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, 10246483 + ... + 10246488.

It is an arithmetic number, because the mean of its divisors is an integer number (20492972).

Almost surely, 2^61478913 is an apocalyptic number.

It is an amenable number.

61478913 is a deficient number, since it is larger than the sum of its proper divisors (20492975).

61478913 is a wasteful number, since it uses less digits than its factorization.

61478913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20492974.

The product of its digits is 36288, while the sum is 39.

The square root of 61478913 is about 7840.8489973982. The cubic root of 61478913 is about 394.6772196161.

The spelling of 61478913 in words is "sixty-one million, four hundred seventy-eight thousand, nine hundred thirteen".