49191491 has 4 divisors (see below), whose sum is σ = 49441392. Its totient is φ = 48941592.

The previous prime is 49191487. The next prime is 49191517. The reversal of 49191491 is 19419194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19419194 = 2 ⋅9709597.

It is a cyclic number.

It is not a de Polignac number, because 49191491 - 2² = 49191487 is a prime.

It is a super-3 number, since 3×49191491³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49191481) 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, 124655 + ... + 125048.

It is an arithmetic number, because the mean of its divisors is an integer number (12360348).

Almost surely, 2^49191491 is an apocalyptic number.

49191491 is a deficient number, since it is larger than the sum of its proper divisors (249901).

49191491 is a wasteful number, since it uses less digits than its factorization.

49191491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249900.

The product of its digits is 11664, while the sum is 38.

The square root of 49191491 is about 7013.6645913531. The cubic root of 49191491 is about 366.4066344589.

The spelling of 49191491 in words is "forty-nine million, one hundred ninety-one thousand, four hundred ninety-one".