29987861 has 2 divisors, whose sum is σ = 29987862. Its totient is φ = 29987860.

The previous prime is 29987857. The next prime is 29987869. The reversal of 29987861 is 16878992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 3010225 = 5194^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 29987861 - 2² = 29987857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29987869) 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 as a sum of consecutive naturals, namely, 14993930 + 14993931.

It is an arithmetic number, because the mean of its divisors is an integer number (14993931).

Almost surely, 2^29987861 is an apocalyptic number.

It is an amenable number.

29987861 is a deficient number, since it is larger than the sum of its proper divisors (1).

29987861 is an equidigital number, since it uses as much as digits as its factorization.

29987861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 29987861 is about 5476.1173289111. The cubic root of 29987861 is about 310.6813352799.

The spelling of 29987861 in words is "twenty-nine million, nine hundred eighty-seven thousand, eight hundred sixty-one".