61445863 has 4 divisors (see below), whose sum is σ = 63106600. Its totient is φ = 59785128.

The previous prime is 61445831. The next prime is 61445887. The reversal of 61445863 is 36854416.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61445863 - 2⁵ = 61445831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1660699 = 61445863 / (6 + 1 + 4 + 4 + 5 + 8 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445893) 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, 830313 + ... + 830386.

It is an arithmetic number, because the mean of its divisors is an integer number (15776650).

Almost surely, 2^61445863 is an apocalyptic number.

61445863 is a deficient number, since it is larger than the sum of its proper divisors (1660737).

61445863 is a wasteful number, since it uses less digits than its factorization.

61445863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660736.

The product of its digits is 69120, while the sum is 37.

The square root of 61445863 is about 7838.7411616917. The cubic root of 61445863 is about 394.6064830574.

The spelling of 61445863 in words is "sixty-one million, four hundred forty-five thousand, eight hundred sixty-three".