694431381 has 48 divisors (see below), whose sum is σ = 1120815168. Its totient is φ = 381024000.

The previous prime is 694431379. The next prime is 694431383. The reversal of 694431381 is 183134496.

It is an interprime number because it is at equal distance from previous prime (694431379) and next prime (694431383).

It is not a de Polignac number, because 694431381 - 2¹ = 694431379 is a prime.

It is a super-2 number, since 2×694431381² = 964469885835134322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (694431383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 384681 + ... + 386481.

It is an arithmetic number, because the mean of its divisors is an integer number (23350316).

Almost surely, 2^694431381 is an apocalyptic number.

694431381 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

694431381 is a deficient number, since it is larger than the sum of its proper divisors (426383787).

694431381 is a wasteful number, since it uses less digits than its factorization.

694431381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1915 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 694431381 is about 26352.0659721396. The cubic root of 694431381 is about 885.5432548249.

The spelling of 694431381 in words is "six hundred ninety-four million, four hundred thirty-one thousand, three hundred eighty-one".