121606151 has 4 divisors (see below), whose sum is σ = 128759472. Its totient is φ = 114452832.

The previous prime is 121606141. The next prime is 121606157. The reversal of 121606151 is 151606121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121606151 - 2¹⁸ = 121344007 is a prime.

It is a super-2 number, since 2×121606151² = 29576111922069602, which contains 22 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 (121606157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576635 + ... + 3576668.

It is an arithmetic number, because the mean of its divisors is an integer number (32189868).

Almost surely, 2^121606151 is an apocalyptic number.

121606151 is a deficient number, since it is larger than the sum of its proper divisors (7153321).

121606151 is an equidigital number, since it uses as much as digits as its factorization.

121606151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7153320.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 121606151 is about 11027.5178984212. The cubic root of 121606151 is about 495.4332852166.

The spelling of 121606151 in words is "one hundred twenty-one million, six hundred six thousand, one hundred fifty-one".