117521261 has 8 divisors (see below), whose sum is σ = 138067104. Its totient is φ = 98619120.

The previous prime is 117521233. The next prime is 117521263. The reversal of 117521261 is 162125711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117521261 - 2¹⁰ = 117520237 is a prime.

It is a super-2 number, since 2×117521261² = 27622493574060242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117521261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117521263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410771 + ... + 411056.

It is an arithmetic number, because the mean of its divisors is an integer number (17258388).

Almost surely, 2^117521261 is an apocalyptic number.

117521261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117521261 is a deficient number, since it is larger than the sum of its proper divisors (20545843).

117521261 is a wasteful number, since it uses less digits than its factorization.

117521261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821851.

The product of its digits is 840, while the sum is 26.

The square root of 117521261 is about 10840.7223467811. The cubic root of 117521261 is about 489.8225943921.

Adding to 117521261 its reverse (162125711), we get a palindrome (279646972).

The spelling of 117521261 in words is "one hundred seventeen million, five hundred twenty-one thousand, two hundred sixty-one".