81701956 has 12 divisors (see below), whose sum is σ = 163403968. Its totient is φ = 35015112.

The previous prime is 81701953. The next prime is 81701959. The reversal of 81701956 is 65910718.

It is an interprime number because it is at equal distance from previous prime (81701953) and next prime (81701959).

81701956 is an admirable number.

It is a super-2 number, since 2×81701956² = 13350419228451872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81701953) 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 3 ways as a sum of consecutive naturals, for example, 1458936 + ... + 1458991.

Almost surely, 2^81701956 is an apocalyptic number.

It is an amenable number.

81701956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81701956 is a wasteful number, since it uses less digits than its factorization.

81701956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917938 (or 2917936 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 81701956 is about 9038.9134302747. The cubic root of 81701956 is about 433.9211491455.

The spelling of 81701956 in words is "eighty-one million, seven hundred one thousand, nine hundred fifty-six".