61345729 has 4 divisors (see below), whose sum is σ = 61386160. Its totient is φ = 61305300.

The previous prime is 61345727. The next prime is 61345733. The reversal of 61345729 is 92754316.

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 61345729 - 2¹ = 61345727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61345721) 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, 17847 + ... + 21004.

It is an arithmetic number, because the mean of its divisors is an integer number (15346540).

Almost surely, 2^61345729 is an apocalyptic number.

It is an amenable number.

61345729 is a deficient number, since it is larger than the sum of its proper divisors (40431).

61345729 is a wasteful number, since it uses less digits than its factorization.

61345729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40430.

The product of its digits is 45360, while the sum is 37.

The square root of 61345729 is about 7832.3514349140. The cubic root of 61345729 is about 394.3920123714.

The spelling of 61345729 in words is "sixty-one million, three hundred forty-five thousand, seven hundred twenty-nine".