31124395009 has 4 divisors (see below), whose sum is σ = 31134988080. Its totient is φ = 31113801940.

The previous prime is 31124394997. The next prime is 31124395019. The reversal of 31124395009 is 90059342113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90059342113 = 13 ⋅6927641701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31124395009 is a prime.

It is a super-2 number, since 2×31124395009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31124395019) 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, 5292127 + ... + 5298004.

It is an arithmetic number, because the mean of its divisors is an integer number (7783747020).

Almost surely, 2^31124395009 is an apocalyptic number.

It is an amenable number.

31124395009 is a deficient number, since it is larger than the sum of its proper divisors (10593071).

31124395009 is a wasteful number, since it uses less digits than its factorization.

31124395009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10593070.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 31124395009 in words is "thirty-one billion, one hundred twenty-four million, three hundred ninety-five thousand, nine".