49951639 has 2 divisors, whose sum is σ = 49951640. Its totient is φ = 49951638.

The previous prime is 49951631. The next prime is 49951669. The reversal of 49951639 is 93615994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49951639 - 2³ = 49951631 is a prime.

It is equal to p_2998387 and since 49951639 and 2998387 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49951631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24975819 + 24975820.

It is an arithmetic number, because the mean of its divisors is an integer number (24975820).

Almost surely, 2^49951639 is an apocalyptic number.

49951639 is a deficient number, since it is larger than the sum of its proper divisors (1).

49951639 is an equidigital number, since it uses as much as digits as its factorization.

49951639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 46.

The square root of 49951639 is about 7067.6473454750. The cubic root of 49951639 is about 368.2843359179.

The spelling of 49951639 in words is "forty-nine million, nine hundred fifty-one thousand, six hundred thirty-nine".