191008977952 has 24 divisors (see below), whose sum is σ = 404975766636. Its totient is φ = 88157989632.

The previous prime is 191008977871. The next prime is 191008977953. The reversal of 191008977952 is 259779800191.

It can be written as a sum of positive squares in 2 ways, for example, as 138000362256 + 53008615696 = 371484^2 + 230236^2 .

It is a super-2 number, since 2×191008977952² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191008977953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229577683 + ... + 229578514.

Almost surely, 2^191008977952 is an apocalyptic number.

It is an amenable number.

191008977952 is an abundant number, since it is smaller than the sum of its proper divisors (213966788684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191008977952 is a wasteful number, since it uses less digits than its factorization.

191008977952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459156220 (or 459156212 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 58.

The spelling of 191008977952 in words is "one hundred ninety-one billion, eight million, nine hundred seventy-seven thousand, nine hundred fifty-two".