693411981 has 8 divisors (see below), whose sum is σ = 964747200. Its totient is φ = 442175712.

The previous prime is 693411959. The next prime is 693411991. The reversal of 693411981 is 189114396.

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

It is not a de Polignac number, because 693411981 - 2¹⁹ = 692887693 is a prime.

It is a super-2 number, since 2×693411981² = 961640350788688722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (693411911) 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, 5024656 + ... + 5024793.

It is an arithmetic number, because the mean of its divisors is an integer number (120593400).

Almost surely, 2^693411981 is an apocalyptic number.

It is an amenable number.

693411981 is a deficient number, since it is larger than the sum of its proper divisors (271335219).

693411981 is a wasteful number, since it uses less digits than its factorization.

693411981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10049475.

The product of its digits is 46656, while the sum is 42.

The square root of 693411981 is about 26332.7169316043. The cubic root of 693411981 is about 885.1097275292.

It can be divided in two parts, 6934 and 11981, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 693411981 in words is "six hundred ninety-three million, four hundred eleven thousand, nine hundred eighty-one".