80857961 has 4 divisors (see below), whose sum is σ = 80926932. Its totient is φ = 80788992.

The previous prime is 80857957. The next prime is 80857981. The reversal of 80857961 is 16975808.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48720400 + 32137561 = 6980^2 + 5669^2 .

It is a cyclic number.

It is not a de Polignac number, because 80857961 - 2² = 80857957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80857921) 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, 32696 + ... + 35081.

It is an arithmetic number, because the mean of its divisors is an integer number (20231733).

Almost surely, 2^80857961 is an apocalyptic number.

It is an amenable number.

80857961 is a deficient number, since it is larger than the sum of its proper divisors (68971).

80857961 is a wasteful number, since it uses less digits than its factorization.

80857961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68970.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 80857961 is about 8992.1054820326. The cubic root of 80857961 is about 432.4218148622.

It can be divided in two parts, 80857 and 961, that added together give a palindrome (81818).

The spelling of 80857961 in words is "eighty million, eight hundred fifty-seven thousand, nine hundred sixty-one".