78171122 has 4 divisors (see below), whose sum is σ = 117256686. Its totient is φ = 39085560.

The previous prime is 78171091. The next prime is 78171127. The reversal of 78171122 is 22117187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22117187 = 17 ⋅1301011.

It can be written as a sum of positive squares in only one way, i.e., 47045881 + 31125241 = 6859^2 + 5579^2 .

It is a super-2 number, since 2×78171122² = 12221448629477768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78171127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19542779 + ... + 19542782.

Almost surely, 2^78171122 is an apocalyptic number.

78171122 is a deficient number, since it is larger than the sum of its proper divisors (39085564).

78171122 is a wasteful number, since it uses less digits than its factorization.

78171122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39085563.

The product of its digits is 1568, while the sum is 29.

The square root of 78171122 is about 8841.4434341910. The cubic root of 78171122 is about 427.5780954645.

The spelling of 78171122 in words is "seventy-eight million, one hundred seventy-one thousand, one hundred twenty-two".