681201537 has 8 divisors (see below), whose sum is σ = 908423520. Its totient is φ = 454056960.

The previous prime is 681201481. The next prime is 681201559. The reversal of 681201537 is 735102186.

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

It is not a de Polignac number, because 681201537 - 2¹⁵ = 681168769 is a prime.

It is a super-2 number, since 2×681201537² = 928071068022324738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681201498 and 681201507.

It is not an unprimeable number, because it can be changed into a prime (681201137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5889 + ... + 37377.

It is an arithmetic number, because the mean of its divisors is an integer number (113552940).

Almost surely, 2^681201537 is an apocalyptic number.

It is an amenable number.

681201537 is a deficient number, since it is larger than the sum of its proper divisors (227221983).

681201537 is a wasteful number, since it uses less digits than its factorization.

681201537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38703.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 681201537 is about 26099.8378730597. The cubic root of 681201537 is about 879.8835662929.

The spelling of 681201537 in words is "six hundred eighty-one million, two hundred one thousand, five hundred thirty-seven".