867520981 has 16 divisors (see below), whose sum is σ = 940120000. Its totient is φ = 797724288.

The previous prime is 867520967. The next prime is 867520991. The reversal of 867520981 is 189025768.

It is a cyclic number.

It is not a de Polignac number, because 867520981 - 2⁵ = 867520949 is a prime.

It is a super-2 number, since 2×867520981² = 1505185304950404722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867520921) 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 15 ways as a sum of consecutive naturals, for example, 349561 + ... + 352033.

It is an arithmetic number, because the mean of its divisors is an integer number (58757500).

Almost surely, 2^867520981 is an apocalyptic number.

It is an amenable number.

867520981 is a deficient number, since it is larger than the sum of its proper divisors (72599019).

867520981 is a wasteful number, since it uses less digits than its factorization.

867520981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 867520981 is about 29453.7091212635. The cubic root of 867520981 is about 953.7326760159.

The spelling of 867520981 in words is "eight hundred sixty-seven million, five hundred twenty thousand, nine hundred eighty-one".