616229991 has 64 divisors (see below), whose sum is σ = 1058682240. Its totient is φ = 350853120.

The previous prime is 616229969. The next prime is 616230029. The reversal of 616229991 is 199922616.

616229991 = T₁₇₀ + T₁₇₁ + ... + T₁₅₄₆.

616229991 is a `hidden beast` number, since 616 + 2 + 29 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 616229991 - 2⁹ = 616229479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616229291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 363141 + ... + 364833.

It is an arithmetic number, because the mean of its divisors is an integer number (16541910).

Almost surely, 2^616229991 is an apocalyptic number.

616229991 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

616229991 is a deficient number, since it is larger than the sum of its proper divisors (442452249).

616229991 is a wasteful number, since it uses less digits than its factorization.

616229991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793 (or 1787 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 616229991 is about 24823.9801603208. The cubic root of 616229991 is about 850.9700533003.

The spelling of 616229991 in words is "six hundred sixteen million, two hundred twenty-nine thousand, nine hundred ninety-one".