78551097 has 4 divisors (see below), whose sum is σ = 104734800. Its totient is φ = 52367396.

The previous prime is 78551089. The next prime is 78551113. The reversal of 78551097 is 79015587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78551097 - 2³ = 78551089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78551047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13091847 + ... + 13091852.

It is an arithmetic number, because the mean of its divisors is an integer number (26183700).

Almost surely, 2^78551097 is an apocalyptic number.

It is an amenable number.

78551097 is a deficient number, since it is larger than the sum of its proper divisors (26183703).

78551097 is a wasteful number, since it uses less digits than its factorization.

78551097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26183702.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 78551097 is about 8862.9056747773. The cubic root of 78551097 is about 428.2697679884.

The spelling of 78551097 in words is "seventy-eight million, five hundred fifty-one thousand, ninety-seven".