80521961 has 16 divisors (see below), whose sum is σ = 88737600. Its totient is φ = 72612288.

The previous prime is 80521957. The next prime is 80521963. The reversal of 80521961 is 16912508.

It is a cyclic number.

It is not a de Polignac number, because 80521961 - 2² = 80521957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80521963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212270 + ... + 212648.

It is an arithmetic number, because the mean of its divisors is an integer number (5546100).

Almost surely, 2^80521961 is an apocalyptic number.

It is an amenable number.

80521961 is a deficient number, since it is larger than the sum of its proper divisors (8215639).

80521961 is a wasteful number, since it uses less digits than its factorization.

80521961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 80521961 is about 8973.4029776891. The cubic root of 80521961 is about 431.8220163729.

The spelling of 80521961 in words is "eighty million, five hundred twenty-one thousand, nine hundred sixty-one".