981695601 has 12 divisors (see below), whose sum is σ = 1418276340. Its totient is φ = 654338400.

The previous prime is 981695597. The next prime is 981695609. The reversal of 981695601 is 106596189.

981695601 is a `hidden beast` number, since 9 + 81 + 6 + 9 + 560 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 576720225 + 404975376 = 24015^2 + 20124^2 .

It is not a de Polignac number, because 981695601 - 2² = 981695597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981695609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87415 + ... + 98003.

It is an arithmetic number, because the mean of its divisors is an integer number (118189695).

Almost surely, 2^981695601 is an apocalyptic number.

It is an amenable number.

981695601 is a deficient number, since it is larger than the sum of its proper divisors (436580739).

981695601 is a wasteful number, since it uses less digits than its factorization.

981695601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20896 (or 20893 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 981695601 is about 31332.0219743316. The cubic root of 981695601 is about 993.8609225181.

The spelling of 981695601 in words is "nine hundred eighty-one million, six hundred ninety-five thousand, six hundred one".