49999251 has 4 divisors (see below), whose sum is σ = 66665672. Its totient is φ = 33332832.

The previous prime is 49999231. The next prime is 49999253. The reversal of 49999251 is 15299994.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 49999251 - 2¹⁹ = 49474963 is a prime.

It is a super-2 number, since 2×49999251² = 4999850201122002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49999251.

It is not an unprimeable number, because it can be changed into a prime (49999253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8333206 + ... + 8333211.

It is an arithmetic number, because the mean of its divisors is an integer number (16666418).

Almost surely, 2^49999251 is an apocalyptic number.

49999251 is a deficient number, since it is larger than the sum of its proper divisors (16666421).

49999251 is a wasteful number, since it uses less digits than its factorization.

49999251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16666420.

The product of its digits is 262440, while the sum is 48.

The square root of 49999251 is about 7071.0148493692. The cubic root of 49999251 is about 368.4013102951.

The spelling of 49999251 in words is "forty-nine million, nine hundred ninety-nine thousand, two hundred fifty-one".