80781511 has 2 divisors, whose sum is σ = 80781512. Its totient is φ = 80781510.

The previous prime is 80781409. The next prime is 80781539. The reversal of 80781511 is 11518708.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80781511 - 2⁷ = 80781383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80781541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390755 + 40390756.

It is an arithmetic number, because the mean of its divisors is an integer number (40390756).

Almost surely, 2^80781511 is an apocalyptic number.

80781511 is a deficient number, since it is larger than the sum of its proper divisors (1).

80781511 is an equidigital number, since it uses as much as digits as its factorization.

80781511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 80781511 is about 8987.8535257313. The cubic root of 80781511 is about 432.2854890895.

The spelling of 80781511 in words is "eighty million, seven hundred eighty-one thousand, five hundred eleven".