80001561 has 16 divisors (see below), whose sum is σ = 109243008. Its totient is φ = 52060800.

The previous prime is 80001557. The next prime is 80001563. The reversal of 80001561 is 16510008.

It is not a de Polignac number, because 80001561 - 2² = 80001557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80001563) 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, 23476 + ... + 26666.

It is an arithmetic number, because the mean of its divisors is an integer number (6827688).

Almost surely, 2^80001561 is an apocalyptic number.

It is an amenable number.

80001561 is a deficient number, since it is larger than the sum of its proper divisors (29241447).

80001561 is a wasteful number, since it uses less digits than its factorization.

80001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 80001561 is about 8944.3591721263. The cubic root of 80001561 is about 430.8897405486.

Adding to 80001561 its reverse (16510008), we get a palindrome (96511569).

The spelling of 80001561 in words is "eighty million, one thousand, five hundred sixty-one".