29129861 has 2 divisors, whose sum is σ = 29129862. Its totient is φ = 29129860.

The previous prime is 29129851. The next prime is 29129873. The reversal of 29129861 is 16892192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 13645636 = 3935^2 + 3694^2 .

It is a cyclic number.

It is not a de Polignac number, because 29129861 - 2⁶ = 29129797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29129851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14564930 + 14564931.

It is an arithmetic number, because the mean of its divisors is an integer number (14564931).

Almost surely, 2^29129861 is an apocalyptic number.

It is an amenable number.

29129861 is a deficient number, since it is larger than the sum of its proper divisors (1).

29129861 is an equidigital number, since it uses as much as digits as its factorization.

29129861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 29129861 is about 5397.2086303940. The cubic root of 29129861 is about 307.6895907084.

The spelling of 29129861 in words is "twenty-nine million, one hundred twenty-nine thousand, eight hundred sixty-one".