15505949 has 2 divisors, whose sum is σ = 15505950. Its totient is φ = 15505948.

The previous prime is 15505937. The next prime is 15505951. The reversal of 15505949 is 94950551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9721924 + 5784025 = 3118^2 + 2405^2 .

It is a cyclic number.

It is not a de Polignac number, because 15505949 - 2¹⁶ = 15440413 is a prime.

It is a Sophie Germain prime.

Together with 15505951, it forms a pair of twin primes.

It is a Chen 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 (15505969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7752974 + 7752975.

It is an arithmetic number, because the mean of its divisors is an integer number (7752975).

Almost surely, 2^15505949 is an apocalyptic number.

It is an amenable number.

15505949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15505949 is an equidigital number, since it uses as much as digits as its factorization.

15505949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 15505949 is about 3937.7593882816. The cubic root of 15505949 is about 249.3634418841.

The spelling of 15505949 in words is "fifteen million, five hundred five thousand, nine hundred forty-nine".