78161091 has 8 divisors (see below), whose sum is σ = 104500224. Its totient is φ = 51964680.

The previous prime is 78161089. The next prime is 78161101. The reversal of 78161091 is 19016187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78161091 - 2¹ = 78161089 is a prime.

It is a super-2 number, since 2×78161091² = 12218312292620562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78161021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34395 + ... + 36596.

It is an arithmetic number, because the mean of its divisors is an integer number (13062528).

Almost surely, 2^78161091 is an apocalyptic number.

78161091 is a deficient number, since it is larger than the sum of its proper divisors (26339133).

78161091 is a wasteful number, since it uses less digits than its factorization.

78161091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71361.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 78161091 is about 8840.8761443649. The cubic root of 78161091 is about 427.5598055929.

The spelling of 78161091 in words is "seventy-eight million, one hundred sixty-one thousand, ninety-one".