49177991 has 4 divisors (see below), whose sum is σ = 52070832. Its totient is φ = 46285152.

The previous prime is 49177987. The next prime is 49178029. The reversal of 49177991 is 19977194.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 49177991 - 2² = 49177987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49177951) 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, 1446395 + ... + 1446428.

It is an arithmetic number, because the mean of its divisors is an integer number (13017708).

Almost surely, 2^49177991 is an apocalyptic number.

49177991 is a deficient number, since it is larger than the sum of its proper divisors (2892841).

49177991 is a wasteful number, since it uses less digits than its factorization.

49177991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892840.

The product of its digits is 142884, while the sum is 47.

The square root of 49177991 is about 7012.7021182993. The cubic root of 49177991 is about 366.3731127933.

The spelling of 49177991 in words is "forty-nine million, one hundred seventy-seven thousand, nine hundred ninety-one".