78601261 has 2 divisors, whose sum is σ = 78601262. Its totient is φ = 78601260.

The previous prime is 78601231. The next prime is 78601277. The reversal of 78601261 is 16210687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 367236 = 8845^2 + 606^2 .

It is an emirp because it is prime and its reverse (16210687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78601261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78601231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39300630 + 39300631.

It is an arithmetic number, because the mean of its divisors is an integer number (39300631).

Almost surely, 2^78601261 is an apocalyptic number.

It is an amenable number.

78601261 is a deficient number, since it is larger than the sum of its proper divisors (1).

78601261 is an equidigital number, since it uses as much as digits as its factorization.

78601261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78601261 is about 8865.7352204992. The cubic root of 78601261 is about 428.3609152535.

The spelling of 78601261 in words is "seventy-eight million, six hundred one thousand, two hundred sixty-one".