49128991 has 2 divisors, whose sum is σ = 49128992. Its totient is φ = 49128990.

The previous prime is 49128967. The next prime is 49129001. The reversal of 49128991 is 19982194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 49128991 - 2²¹ = 47031839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49128901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24564495 + 24564496.

It is an arithmetic number, because the mean of its divisors is an integer number (24564496).

Almost surely, 2^49128991 is an apocalyptic number.

49128991 is a deficient number, since it is larger than the sum of its proper divisors (1).

49128991 is an equidigital number, since it uses as much as digits as its factorization.

49128991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 49128991 is about 7009.2075871670. The cubic root of 49128991 is about 366.2513899934.

The spelling of 49128991 in words is "forty-nine million, one hundred twenty-eight thousand, nine hundred ninety-one".