61309699 has 4 divisors (see below), whose sum is σ = 66883320. Its totient is φ = 55736080.

The previous prime is 61309687. The next prime is 61309709. The reversal of 61309699 is 99690316.

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 61309699 - 2⁷ = 61309571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61301699) 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, 2786794 + ... + 2786815.

It is an arithmetic number, because the mean of its divisors is an integer number (16720830).

Almost surely, 2^61309699 is an apocalyptic number.

61309699 is a deficient number, since it is larger than the sum of its proper divisors (5573621).

61309699 is a wasteful number, since it uses less digits than its factorization.

61309699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573620.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 61309699 is about 7830.0510215451. The cubic root of 61309699 is about 394.3147848974.

The spelling of 61309699 in words is "sixty-one million, three hundred nine thousand, six hundred ninety-nine".