131978199 has 8 divisors (see below), whose sum is σ = 185232640. Its totient is φ = 83354616.

The previous prime is 131978183. The next prime is 131978207. The reversal of 131978199 is 991879131.

It is a happy number.

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

It is not a de Polignac number, because 131978199 - 2⁴ = 131978183 is a prime.

It is a super-2 number, since 2×131978199² = 34836490022567202, 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 (131978699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157647 + ... + 1157760.

It is an arithmetic number, because the mean of its divisors is an integer number (23154080).

Almost surely, 2^131978199 is an apocalyptic number.

131978199 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131978199 is a deficient number, since it is larger than the sum of its proper divisors (53254441).

131978199 is a wasteful number, since it uses less digits than its factorization.

131978199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315429.

The product of its digits is 122472, while the sum is 48.

The square root of 131978199 is about 11488.1764871541. The cubic root of 131978199 is about 509.1363043829.

The spelling of 131978199 in words is "one hundred thirty-one million, nine hundred seventy-eight thousand, one hundred ninety-nine".