31428715981 has 8 divisors (see below), whose sum is σ = 33848665760. Its totient is φ = 29009102832.

The previous prime is 31428715979. The next prime is 31428716003. The reversal of 31428715981 is 18951782413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31428715981 - 2¹ = 31428715979 is a prime.

It is a super-2 number, since 2×31428715981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31428715921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129946 + ... + 282388.

It is an arithmetic number, because the mean of its divisors is an integer number (4231083220).

Almost surely, 2^31428715981 is an apocalyptic number.

It is an amenable number.

31428715981 is a deficient number, since it is larger than the sum of its proper divisors (2419949779).

31428715981 is a wasteful number, since it uses less digits than its factorization.

31428715981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168315.

The product of its digits is 483840, while the sum is 49.

The spelling of 31428715981 in words is "thirty-one billion, four hundred twenty-eight million, seven hundred fifteen thousand, nine hundred eighty-one".