117861547 has 2 divisors, whose sum is σ = 117861548. Its totient is φ = 117861546.

The previous prime is 117861529. The next prime is 117861563. The reversal of 117861547 is 745168711.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117861547 is a prime.

It is a super-2 number, since 2×117861547² = 27782688522466418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (117861517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58930773 + 58930774.

It is an arithmetic number, because the mean of its divisors is an integer number (58930774).

Almost surely, 2^117861547 is an apocalyptic number.

117861547 is a deficient number, since it is larger than the sum of its proper divisors (1).

117861547 is an equidigital number, since it uses as much as digits as its factorization.

117861547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 40.

The square root of 117861547 is about 10856.4058048693. The cubic root of 117861547 is about 490.2949036945.

The spelling of 117861547 in words is "one hundred seventeen million, eight hundred sixty-one thousand, five hundred forty-seven".