612991099 has 16 divisors (see below), whose sum is σ = 728627200. Its totient is φ = 504732384.

The previous prime is 612991087. The next prime is 612991157. The reversal of 612991099 is 990199216.

It is a cyclic number.

It is not a de Polignac number, because 612991099 - 2¹³ = 612982907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612991069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5482 + ... + 35440.

It is an arithmetic number, because the mean of its divisors is an integer number (45539200).

Almost surely, 2^612991099 is an apocalyptic number.

612991099 is a deficient number, since it is larger than the sum of its proper divisors (115636101).

612991099 is a wasteful number, since it uses less digits than its factorization.

612991099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30082.

The product of its (nonzero) digits is 78732, while the sum is 46.

The square root of 612991099 is about 24758.6570516254. The cubic root of 612991099 is about 849.4765399847.

The spelling of 612991099 in words is "six hundred twelve million, nine hundred ninety-one thousand, ninety-nine".