48311991 has 72 divisors (see below), whose sum is σ = 91386960. Its totient is φ = 25002432.

The previous prime is 48311971. The next prime is 48311993. The reversal of 48311991 is 19911384.

It is not a de Polignac number, because 48311991 - 2¹³ = 48303799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (48311993) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 911521 + ... + 911573.

Almost surely, 2^48311991 is an apocalyptic number.

48311991 is a deficient number, since it is larger than the sum of its proper divisors (43074969).

48311991 is a wasteful number, since it uses less digits than its factorization.

48311991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 76 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 48311991 is about 6950.6827722174. The cubic root of 48311991 is about 364.2098149338.

The spelling of 48311991 in words is "forty-eight million, three hundred eleven thousand, nine hundred ninety-one".