49019851 has 4 divisors (see below), whose sum is σ = 49034704. Its totient is φ = 49005000.

The previous prime is 49019837. The next prime is 49019881. The reversal of 49019851 is 15891094.

49019851 is a nontrivial binomial coefficient, being equal to C(9902, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 15891094 = 2 ⋅7945547.

It is a 3-Lehmer number, since φ(49019851) divides (49019851-1)³.

It is a cyclic number.

It is not a de Polignac number, because 49019851 - 2¹⁵ = 48987083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49019851.

It is not an unprimeable number, because it can be changed into a prime (49019801) 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, 1 + ... + 9901.

It is an arithmetic number, because the mean of its divisors is an integer number (12258676).

Almost surely, 2^49019851 is an apocalyptic number.

49019851 is the 9901-st triangular number and also the 4951-st hexagonal number.

49019851 is the 3301-st centered nonagonal number.

49019851 is a deficient number, since it is larger than the sum of its proper divisors (14853).

49019851 is an equidigital number, since it uses as much as digits as its factorization.

49019851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14852.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 49019851 is about 7001.4177849918. The cubic root of 49019851 is about 365.9799798937.

The spelling of 49019851 in words is "forty-nine million, nineteen thousand, eight hundred fifty-one".