97778519 has 4 divisors (see below), whose sum is σ = 97798344. Its totient is φ = 97758696.

The previous prime is 97778491. The next prime is 97778521. The reversal of 97778519 is 91587779.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97778519 - 2¹⁶ = 97712983 is a prime.

It is a super-2 number, since 2×97778519² = 19121277555666722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97778539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3929 + ... + 14525.

It is an arithmetic number, because the mean of its divisors is an integer number (24449586).

Almost surely, 2^97778519 is an apocalyptic number.

97778519 is a deficient number, since it is larger than the sum of its proper divisors (19825).

97778519 is a wasteful number, since it uses less digits than its factorization.

97778519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824.

The product of its digits is 1111320, while the sum is 53.

The square root of 97778519 is about 9888.3021292839. The cubic root of 97778519 is about 460.6960461249.

The spelling of 97778519 in words is "ninety-seven million, seven hundred seventy-eight thousand, five hundred nineteen".