78411149 has 2 divisors, whose sum is σ = 78411150. Its totient is φ = 78411148.

The previous prime is 78411143. The next prime is 78411173. The reversal of 78411149 is 94111487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74269924 + 4141225 = 8618^2 + 2035^2 .

It is an emirp because it is prime and its reverse (94111487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78411149 - 2²⁰ = 77362573 is a prime.

It is a super-2 number, since 2×78411149² = 12296616575000402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78411143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39205574 + 39205575.

It is an arithmetic number, because the mean of its divisors is an integer number (39205575).

Almost surely, 2^78411149 is an apocalyptic number.

It is an amenable number.

78411149 is a deficient number, since it is larger than the sum of its proper divisors (1).

78411149 is an equidigital number, since it uses as much as digits as its factorization.

78411149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 78411149 is about 8855.0070016912. The cubic root of 78411149 is about 428.0152791733.

The spelling of 78411149 in words is "seventy-eight million, four hundred eleven thousand, one hundred forty-nine".