78485551 has 2 divisors, whose sum is σ = 78485552. Its totient is φ = 78485550.

The previous prime is 78485543. The next prime is 78485557. The reversal of 78485551 is 15558487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78485551 - 2³ = 78485543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78485498 and 78485507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78485557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39242775 + 39242776.

It is an arithmetic number, because the mean of its divisors is an integer number (39242776).

Almost surely, 2^78485551 is an apocalyptic number.

78485551 is a deficient number, since it is larger than the sum of its proper divisors (1).

78485551 is an equidigital number, since it uses as much as digits as its factorization.

78485551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224000, while the sum is 43.

The square root of 78485551 is about 8859.2071315666. The cubic root of 78485551 is about 428.1506133539.

The spelling of 78485551 in words is "seventy-eight million, four hundred eighty-five thousand, five hundred fifty-one".