681435515 has 8 divisors (see below), whose sum is σ = 819859968. Its totient is φ = 543723520.

The previous prime is 681435511. The next prime is 681435553. The reversal of 681435515 is 515534186.

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

It is not a de Polignac number, because 681435515 - 2² = 681435511 is a prime.

It is a super-2 number, since 2×681435515² = 928708722206630450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681435511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176006 + ... + 179835.

It is an arithmetic number, because the mean of its divisors is an integer number (102482496).

Almost surely, 2^681435515 is an apocalyptic number.

681435515 is a deficient number, since it is larger than the sum of its proper divisors (138424453).

681435515 is a wasteful number, since it uses less digits than its factorization.

681435515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356229.

The product of its digits is 72000, while the sum is 38.

The square root of 681435515 is about 26104.3198532350. The cubic root of 681435515 is about 879.9842950882.

The spelling of 681435515 in words is "six hundred eighty-one million, four hundred thirty-five thousand, five hundred fifteen".