191649051 has 32 divisors (see below), whose sum is σ = 315014400. Its totient is φ = 114171840.

The previous prime is 191649013. The next prime is 191649053. The reversal of 191649051 is 150946191.

191649051 is a `hidden beast` number, since 1 + 9 + 1 + 649 + 0 + 5 + 1 = 666.

It is not a de Polignac number, because 191649051 - 2⁹ = 191648539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191648997 and 191649015.

It is not an unprimeable number, because it can be changed into a prime (191649053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12055 + ... + 22991.

It is an arithmetic number, because the mean of its divisors is an integer number (9844200).

Almost surely, 2^191649051 is an apocalyptic number.

191649051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

191649051 is a deficient number, since it is larger than the sum of its proper divisors (123365349).

191649051 is a wasteful number, since it uses less digits than its factorization.

191649051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11016 (or 11010 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 191649051 is about 13843.7368871270. The cubic root of 191649051 is about 576.5481164896.

The spelling of 191649051 in words is "one hundred ninety-one million, six hundred forty-nine thousand, fifty-one".