61306713121 has 4 divisors (see below), whose sum is σ = 61901924032. Its totient is φ = 60711502212.

The previous prime is 61306713119. The next prime is 61306713133. The reversal of 61306713121 is 12131760316.

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 61306713121 - 2¹ = 61306713119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61306713151) 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, 297605301 + ... + 297605506.

It is an arithmetic number, because the mean of its divisors is an integer number (15475481008).

Almost surely, 2^61306713121 is an apocalyptic number.

It is an amenable number.

61306713121 is a deficient number, since it is larger than the sum of its proper divisors (595210911).

61306713121 is a wasteful number, since it uses less digits than its factorization.

61306713121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595210910.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 61306713121 in words is "sixty-one billion, three hundred six million, seven hundred thirteen thousand, one hundred twenty-one".