61249431311 has 4 divisors (see below), whose sum is σ = 61250247072. Its totient is φ = 61248615552.

The previous prime is 61249431307. The next prime is 61249431407. The reversal of 61249431311 is 11313494216.

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 61249431311 - 2² = 61249431307 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 (61249431011) 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, 282386 + ... + 449711.

It is an arithmetic number, because the mean of its divisors is an integer number (15312561768).

Almost surely, 2^61249431311 is an apocalyptic number.

61249431311 is a deficient number, since it is larger than the sum of its proper divisors (815761).

61249431311 is an equidigital number, since it uses as much as digits as its factorization.

61249431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815760.

The product of its digits is 15552, while the sum is 35.

The spelling of 61249431311 in words is "sixty-one billion, two hundred forty-nine million, four hundred thirty-one thousand, three hundred eleven".