49435901991 has 48 divisors (see below), whose sum is σ = 86222304000. Its totient is φ = 27908674416.

The previous prime is 49435901981. The next prime is 49435901993. The reversal of 49435901991 is 19910953494.

It is a happy number.

49435901991 is a `hidden beast` number, since 4 + 9 + 43 + 590 + 1 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 49435901991 - 2¹⁰ = 49435900967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49435901993) 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 in 47 ways as a sum of consecutive naturals, for example, 115291 + ... + 334908.

It is an arithmetic number, because the mean of its divisors is an integer number (1796298000).

Almost surely, 2^49435901991 is an apocalyptic number.

49435901991 is a deficient number, since it is larger than the sum of its proper divisors (36786402009).

49435901991 is a wasteful number, since it uses less digits than its factorization.

49435901991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450305 (or 450292 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 49435901991 in words is "forty-nine billion, four hundred thirty-five million, nine hundred one thousand, nine hundred ninety-one".