681393052 has 6 divisors (see below), whose sum is σ = 1192437848. Its totient is φ = 340696524.

The previous prime is 681393001. The next prime is 681393059. The reversal of 681393052 is 250393186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681393059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85174128 + ... + 85174135.

Almost surely, 2^681393052 is an apocalyptic number.

It is an amenable number.

681393052 is a deficient number, since it is larger than the sum of its proper divisors (511044796).

681393052 is a wasteful number, since it uses less digits than its factorization.

681393052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170348267 (or 170348265 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 681393052 is about 26103.5065077472. The cubic root of 681393052 is about 879.9660162496.

The spelling of 681393052 in words is "six hundred eighty-one million, three hundred ninety-three thousand, fifty-two".