61444729 has 4 divisors (see below), whose sum is σ = 61535376. Its totient is φ = 61354084.

The previous prime is 61444723. The next prime is 61444741. The reversal of 61444729 is 92744416.

It is a happy number.

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 61444729 - 2²¹ = 59347577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61444723) 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, 44299 + ... + 45664.

It is an arithmetic number, because the mean of its divisors is an integer number (15383844).

Almost surely, 2^61444729 is an apocalyptic number.

It is an amenable number.

61444729 is a deficient number, since it is larger than the sum of its proper divisors (90647).

61444729 is an equidigital number, since it uses as much as digits as its factorization.

61444729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90646.

The product of its digits is 48384, while the sum is 37.

The square root of 61444729 is about 7838.6688283152. The cubic root of 61444729 is about 394.6040555193.

The spelling of 61444729 in words is "sixty-one million, four hundred forty-four thousand, seven hundred twenty-nine".