29999997871 has 2 divisors, whose sum is σ = 29999997872. Its totient is φ = 29999997870.

The previous prime is 29999997857. The next prime is 29999997889. The reversal of 29999997871 is 17879999992.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 29999997871 - 2³¹ = 27852514223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29999997791 and 29999997800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29999997821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14999998935 + 14999998936.

It is an arithmetic number, because the mean of its divisors is an integer number (14999998936).

Almost surely, 2^29999997871 is an apocalyptic number.

29999997871 is a deficient number, since it is larger than the sum of its proper divisors (1).

29999997871 is an equidigital number, since it uses as much as digits as its factorization.

29999997871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 416649744, while the sum is 79.

The spelling of 29999997871 in words is "twenty-nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred seventy-one".