121155951 has 16 divisors (see below), whose sum is σ = 194336000. Its totient is φ = 65587968.

The previous prime is 121155949. The next prime is 121155953. The reversal of 121155951 is 159551121.

It is an interprime number because it is at equal distance from previous prime (121155949) and next prime (121155953).

It is not a de Polignac number, because 121155951 - 2¹ = 121155949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121155953) 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, 151426 + ... + 152223.

It is an arithmetic number, because the mean of its divisors is an integer number (12146000).

Almost surely, 2^121155951 is an apocalyptic number.

121155951 is a deficient number, since it is larger than the sum of its proper divisors (73180049).

121155951 is a wasteful number, since it uses less digits than its factorization.

121155951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303678.

The product of its digits is 2250, while the sum is 30.

The square root of 121155951 is about 11007.0863992248. The cubic root of 121155951 is about 494.8211454643.

The spelling of 121155951 in words is "one hundred twenty-one million, one hundred fifty-five thousand, nine hundred fifty-one".