61239249709 has 16 divisors (see below), whose sum is σ = 68819472576. Its totient is φ = 54003628800.

The previous prime is 61239249703. The next prime is 61239249761. The reversal of 61239249709 is 90794293216.

It is a happy number.

It is not a de Polignac number, because 61239249709 - 2¹¹ = 61239247661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61239249703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92572 + ... + 362005.

It is an arithmetic number, because the mean of its divisors is an integer number (4301217036).

Almost surely, 2^61239249709 is an apocalyptic number.

It is an amenable number.

61239249709 is a deficient number, since it is larger than the sum of its proper divisors (7580222867).

61239249709 is a wasteful number, since it uses less digits than its factorization.

61239249709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454956.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 61239249709 in words is "sixty-one billion, two hundred thirty-nine million, two hundred forty-nine thousand, seven hundred nine".