121551131 has 8 divisors (see below), whose sum is σ = 131061840. Its totient is φ = 112063392.

The previous prime is 121551109. The next prime is 121551161. The reversal of 121551131 is 131155121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121551131 is a prime.

It is a super-2 number, since 2×121551131² = 29549354894758322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121551161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6185 + ... + 16773.

It is an arithmetic number, because the mean of its divisors is an integer number (16382730).

Almost surely, 2^121551131 is an apocalyptic number.

121551131 is a deficient number, since it is larger than the sum of its proper divisors (9510709).

121551131 is a wasteful number, since it uses less digits than its factorization.

121551131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11485.

The product of its digits is 150, while the sum is 20.

The square root of 121551131 is about 11025.0229478219. The cubic root of 121551131 is about 495.3585553032.

The spelling of 121551131 in words is "one hundred twenty-one million, five hundred fifty-one thousand, one hundred thirty-one".