29691989 has 2 divisors, whose sum is σ = 29691990. Its totient is φ = 29691988.

The previous prime is 29691967. The next prime is 29692001. The reversal of 29691989 is 98919692.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29343889 + 348100 = 5417^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 29691989 - 2¹² = 29687893 is a prime.

It is a super-2 number, since 2×29691989² = 1763228421552242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 29691989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29697989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14845994 + 14845995.

It is an arithmetic number, because the mean of its divisors is an integer number (14845995).

Almost surely, 2^29691989 is an apocalyptic number.

It is an amenable number.

29691989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29691989 is an equidigital number, since it uses as much as digits as its factorization.

29691989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 53.

The square root of 29691989 is about 5449.0356027466. The cubic root of 29691989 is about 309.6561883755.

The spelling of 29691989 in words is "twenty-nine million, six hundred ninety-one thousand, nine hundred eighty-nine".