49497991 has 4 divisors (see below), whose sum is σ = 50337000. Its totient is φ = 48658984.

The previous prime is 49497977. The next prime is 49498027. The reversal of 49497991 is 19979494.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19979494 = 2 ⋅9989747.

It is a cyclic number.

It is not a de Polignac number, because 49497991 - 2⁹ = 49497479 is a prime.

It is a super-2 number, since 2×49497991² = 4900102226072162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49497191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419416 + ... + 419533.

It is an arithmetic number, because the mean of its divisors is an integer number (12584250).

Almost surely, 2^49497991 is an apocalyptic number.

49497991 is a deficient number, since it is larger than the sum of its proper divisors (839009).

49497991 is an equidigital number, since it uses as much as digits as its factorization.

49497991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839008.

The product of its digits is 734832, while the sum is 52.

The square root of 49497991 is about 7035.4808648734. The cubic root of 49497991 is about 367.1660557182.

The spelling of 49497991 in words is "forty-nine million, four hundred ninety-seven thousand, nine hundred ninety-one".