80078561 has 2 divisors, whose sum is σ = 80078562. Its totient is φ = 80078560.

The previous prime is 80078539. The next prime is 80078567. The reversal of 80078561 is 16587008.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 65536 = 8945^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 80078561 - 2²² = 75884257 is a prime.

It is not a weakly prime, because it can be changed into another prime (80078567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40039280 + 40039281.

It is an arithmetic number, because the mean of its divisors is an integer number (40039281).

Almost surely, 2^80078561 is an apocalyptic number.

It is an amenable number.

80078561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80078561 is an equidigital number, since it uses as much as digits as its factorization.

80078561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 80078561 is about 8948.6625257633. The cubic root of 80078561 is about 431.0279373152.

The spelling of 80078561 in words is "eighty million, seventy-eight thousand, five hundred sixty-one".