121558261 has 8 divisors (see below), whose sum is σ = 132738048. Its totient is φ = 110400000.

The previous prime is 121558237. The next prime is 121558267. The reversal of 121558261 is 162855121.

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 121558261 - 2⁷ = 121558133 is a prime.

It is a super-3 number, since 3×121558261³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121558267) 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, 7861 + ... + 17461.

It is an arithmetic number, because the mean of its divisors is an integer number (16592256).

Almost surely, 2^121558261 is an apocalyptic number.

121558261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121558261 is a deficient number, since it is larger than the sum of its proper divisors (11179787).

121558261 is a wasteful number, since it uses less digits than its factorization.

121558261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10763.

The product of its digits is 4800, while the sum is 31.

The square root of 121558261 is about 11025.3462984162. The cubic root of 121558261 is about 495.3682407675.

The spelling of 121558261 in words is "one hundred twenty-one million, five hundred fifty-eight thousand, two hundred sixty-one".