191640550 has 12 divisors (see below), whose sum is σ = 356451516. Its totient is φ = 76656200.

The previous prime is 191640521. The next prime is 191640563. The reversal of 191640550 is 55046191.

It is a super-2 number, since 2×191640550² = 73452200808605000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1916356 + ... + 1916455.

It is an arithmetic number, because the mean of its divisors is an integer number (29704293).

Almost surely, 2^191640550 is an apocalyptic number.

191640550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191640550 is a deficient number, since it is larger than the sum of its proper divisors (164810966).

191640550 is a wasteful number, since it uses less digits than its factorization.

191640550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832823 (or 3832818 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 191640550 is about 13843.4298495712. The cubic root of 191640550 is about 576.5395916922.

The spelling of 191640550 in words is "one hundred ninety-one million, six hundred forty thousand, five hundred fifty".