612991143 has 6 divisors (see below), whose sum is σ = 885431664. Its totient is φ = 408660756.

The previous prime is 612991087. The next prime is 612991157. The reversal of 612991143 is 341199216.

It is a happy number.

It is not a de Polignac number, because 612991143 - 2⁸ = 612990887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 612991098 and 612991107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612991843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34055055 + ... + 34055072.

It is an arithmetic number, because the mean of its divisors is an integer number (147571944).

Almost surely, 2^612991143 is an apocalyptic number.

612991143 is a deficient number, since it is larger than the sum of its proper divisors (272440521).

612991143 is a wasteful number, since it uses less digits than its factorization.

612991143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68110133 (or 68110130 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 612991143 is about 24758.6579402035. The cubic root of 612991143 is about 849.4765603097.

The spelling of 612991143 in words is "six hundred twelve million, nine hundred ninety-one thousand, one hundred forty-three".