861981069093 has 8 divisors (see below), whose sum is σ = 1149316247808. Its totient is φ = 574649968224.

The previous prime is 861981069083. The next prime is 861981069133. The reversal of 861981069093 is 390960189168.

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

It is a de Polignac number, because none of the positive numbers 2^k-861981069093 is a prime.

It is a super-2 number, since 2×861981069093² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861981069023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486421 + ... + 1400202.

It is an arithmetic number, because the mean of its divisors is an integer number (143664530976).

Almost surely, 2^861981069093 is an apocalyptic number.

It is an amenable number.

861981069093 is a deficient number, since it is larger than the sum of its proper divisors (287335178715).

861981069093 is a wasteful number, since it uses less digits than its factorization.

861981069093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038923.

The product of its (nonzero) digits is 5038848, while the sum is 60.

The spelling of 861981069093 in words is "eight hundred sixty-one billion, nine hundred eighty-one million, sixty-nine thousand, ninety-three".