78119691001 has 9 divisors (see below), whose sum is σ = 85870477903. Its totient is φ = 71015105920.

The previous prime is 78119690959. The next prime is 78119691007. The reversal of 78119691001 is 10019691187.

The square root of 78119691001 is 279499.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6552740601 + 71566950400 = 80949^2 + 267520^2 .

It is not a de Polignac number, because 78119691001 - 2⁹ = 78119690489 is a prime.

It is a super-2 number, since 2×78119691001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78119691007) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3061785 + ... + 3087193.

Almost surely, 2^78119691001 is an apocalyptic number.

78119691001 is the 279499-th square number.

78119691001 is the 139750-th centered octagonal number.

It is an amenable number.

78119691001 is a deficient number, since it is larger than the sum of its proper divisors (7750786902).

78119691001 is an frugal number, since it uses more digits than its factorization.

78119691001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50840 (or 25420 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 43.

The spelling of 78119691001 in words is "seventy-eight billion, one hundred nineteen million, six hundred ninety-one thousand, one".