29861861 has 2 divisors, whose sum is σ = 29861862. Its totient is φ = 29861860.

The previous prime is 29861857. The next prime is 29861917. The reversal of 29861861 is 16816892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 10764961 = 4370^2 + 3281^2 .

It is a cyclic number.

It is not a de Polignac number, because 29861861 - 2² = 29861857 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 (29861801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14930930 + 14930931.

It is an arithmetic number, because the mean of its divisors is an integer number (14930931).

Almost surely, 2^29861861 is an apocalyptic number.

It is an amenable number.

29861861 is a deficient number, since it is larger than the sum of its proper divisors (1).

29861861 is an equidigital number, since it uses as much as digits as its factorization.

29861861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 29861861 is about 5464.6007173443. The cubic root of 29861861 is about 310.2455944873.

The spelling of 29861861 in words is "twenty-nine million, eight hundred sixty-one thousand, eight hundred sixty-one".