81700963 has 4 divisors (see below), whose sum is σ = 86506920. Its totient is φ = 76895008.

The previous prime is 81700937. The next prime is 81701029. The reversal of 81700963 is 36900718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36900718 = 2 ⋅18450359.

It is a cyclic number.

It is not a de Polignac number, because 81700963 - 2¹³ = 81692771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81700763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2402953 + ... + 2402986.

It is an arithmetic number, because the mean of its divisors is an integer number (21626730).

Almost surely, 2^81700963 is an apocalyptic number.

81700963 is a deficient number, since it is larger than the sum of its proper divisors (4805957).

81700963 is a wasteful number, since it uses less digits than its factorization.

81700963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805956.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 81700963 is about 9038.8585009392. The cubic root of 81700963 is about 433.9193911890.

The spelling of 81700963 in words is "eighty-one million, seven hundred thousand, nine hundred sixty-three".