117125781 has 16 divisors (see below), whose sum is σ = 161679360. Its totient is φ = 75342960.

The previous prime is 117125741. The next prime is 117125783. The reversal of 117125781 is 187521711.

It is not a de Polignac number, because 117125781 - 2¹⁰ = 117124757 is a prime.

It is a super-2 number, since 2×117125781² = 27436897149719922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117125783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33586 + ... + 36908.

It is an arithmetic number, because the mean of its divisors is an integer number (10104960).

Almost surely, 2^117125781 is an apocalyptic number.

It is an amenable number.

117125781 is a deficient number, since it is larger than the sum of its proper divisors (44553579).

117125781 is a wasteful number, since it uses less digits than its factorization.

117125781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736.

The product of its digits is 3920, while the sum is 33.

The square root of 117125781 is about 10822.4664933646. The cubic root of 117125781 is about 489.2725301162.

The spelling of 117125781 in words is "one hundred seventeen million, one hundred twenty-five thousand, seven hundred eighty-one".