70851681 has 12 divisors (see below), whose sum is σ = 103783680. Its totient is φ = 46568760.

The previous prime is 70851679. The next prime is 70851713. The reversal of 70851681 is 18615807.

It is not a de Polignac number, because 70851681 - 2¹ = 70851679 is a prime.

It is a super-2 number, since 2×70851681² = 10039921401051522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70851181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54801 + ... + 56078.

It is an arithmetic number, because the mean of its divisors is an integer number (8648640).

Almost surely, 2^70851681 is an apocalyptic number.

70851681 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

70851681 is a deficient number, since it is larger than the sum of its proper divisors (32931999).

70851681 is a wasteful number, since it uses less digits than its factorization.

70851681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110956 (or 110953 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 70851681 is about 8417.3440585496. The cubic root of 70851681 is about 413.7932349863.

The spelling of 70851681 in words is "seventy million, eight hundred fifty-one thousand, six hundred eighty-one".