78521341 has 2 divisors, whose sum is σ = 78521342. Its totient is φ = 78521340.

The previous prime is 78521323. The next prime is 78521347. The reversal of 78521341 is 14312587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69789316 + 8732025 = 8354^2 + 2955^2 .

It is a cyclic number.

It is not a de Polignac number, because 78521341 - 2⁵ = 78521309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78521347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39260670 + 39260671.

It is an arithmetic number, because the mean of its divisors is an integer number (39260671).

Almost surely, 2^78521341 is an apocalyptic number.

It is an amenable number.

78521341 is a deficient number, since it is larger than the sum of its proper divisors (1).

78521341 is an equidigital number, since it uses as much as digits as its factorization.

78521341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 78521341 is about 8861.2268337968. The cubic root of 78521341 is about 428.2156834278.

The spelling of 78521341 in words is "seventy-eight million, five hundred twenty-one thousand, three hundred forty-one".