49997551 has 4 divisors (see below), whose sum is σ = 50192352. Its totient is φ = 49802752.

The previous prime is 49997509. The next prime is 49997567. The reversal of 49997551 is 15579994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15579994 = 2 ⋅7789997.

It is a cyclic number.

It is not a de Polignac number, because 49997551 - 2⁹ = 49997039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 49997495 and 49997504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49997501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97015 + ... + 97528.

It is an arithmetic number, because the mean of its divisors is an integer number (12548088).

Almost surely, 2^49997551 is an apocalyptic number.

49997551 is a deficient number, since it is larger than the sum of its proper divisors (194801).

49997551 is a wasteful number, since it uses less digits than its factorization.

49997551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194800.

The product of its digits is 510300, while the sum is 49.

The square root of 49997551 is about 7070.8946392942. The cubic root of 49997551 is about 368.3971349704.

The spelling of 49997551 in words is "forty-nine million, nine hundred ninety-seven thousand, five hundred fifty-one".