61918449 has 4 divisors (see below), whose sum is σ = 82557936. Its totient is φ = 41278964.

The previous prime is 61918429. The next prime is 61918459. The reversal of 61918449 is 94481916.

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 a cyclic number.

It is not a de Polignac number, because 61918449 - 2¹³ = 61910257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61918449.

It is not an unprimeable number, because it can be changed into a prime (61918429) 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, 10319739 + ... + 10319744.

It is an arithmetic number, because the mean of its divisors is an integer number (20639484).

Almost surely, 2^61918449 is an apocalyptic number.

It is an amenable number.

61918449 is a deficient number, since it is larger than the sum of its proper divisors (20639487).

61918449 is a wasteful number, since it uses less digits than its factorization.

61918449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20639486.

The product of its digits is 62208, while the sum is 42.

The square root of 61918449 is about 7868.8276763442. The cubic root of 61918449 is about 395.6155525597.

The spelling of 61918449 in words is "sixty-one million, nine hundred eighteen thousand, four hundred forty-nine".