29987791949 has 2 divisors, whose sum is σ = 29987791950. Its totient is φ = 29987791948.

The previous prime is 29987791901. The next prime is 29987791963. The reversal of 29987791949 is 94919778992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23567776324 + 6420015625 = 153518^2 + 80125^2 .

It is a cyclic number.

It is not a de Polignac number, because 29987791949 - 2¹² = 29987787853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29987791049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14993895974 + 14993895975.

It is an arithmetic number, because the mean of its divisors is an integer number (14993895975).

Almost surely, 2^29987791949 is an apocalyptic number.

It is an amenable number.

29987791949 is a deficient number, since it is larger than the sum of its proper divisors (1).

29987791949 is an equidigital number, since it uses as much as digits as its factorization.

29987791949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 74.

The spelling of 29987791949 in words is "twenty-nine billion, nine hundred eighty-seven million, seven hundred ninety-one thousand, nine hundred forty-nine".