117971549 has 2 divisors, whose sum is σ = 117971550. Its totient is φ = 117971548.

The previous prime is 117971537. The next prime is 117971573. The reversal of 117971549 is 945179711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 51222649 = 8170^2 + 7157^2 .

It is a cyclic number.

It is not a de Polignac number, because 117971549 - 2⁴ = 117971533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117971509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58985774 + 58985775.

It is an arithmetic number, because the mean of its divisors is an integer number (58985775).

Almost surely, 2^117971549 is an apocalyptic number.

It is an amenable number.

117971549 is a deficient number, since it is larger than the sum of its proper divisors (1).

117971549 is an equidigital number, since it uses as much as digits as its factorization.

117971549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 44.

The square root of 117971549 is about 10861.4708488307. The cubic root of 117971549 is about 490.4473895309.

The spelling of 117971549 in words is "one hundred seventeen million, nine hundred seventy-one thousand, five hundred forty-nine".