78131411 has 2 divisors, whose sum is σ = 78131412. Its totient is φ = 78131410.

The previous prime is 78131407. The next prime is 78131429. The reversal of 78131411 is 11413187.

It is a weak prime.

It is an emirp because it is prime and its reverse (11413187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78131411 - 2² = 78131407 is a prime.

It is a super-2 number, since 2×78131411² = 12209034769701842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78131491) 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, 39065705 + 39065706.

It is an arithmetic number, because the mean of its divisors is an integer number (39065706).

Almost surely, 2^78131411 is an apocalyptic number.

78131411 is a deficient number, since it is larger than the sum of its proper divisors (1).

78131411 is an equidigital number, since it uses as much as digits as its factorization.

78131411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

The square root of 78131411 is about 8839.1974183180. The cubic root of 78131411 is about 427.5056798488.

Adding to 78131411 its reverse (11413187), we get a palindrome (89544598).

The spelling of 78131411 in words is "seventy-eight million, one hundred thirty-one thousand, four hundred eleven".