121009951 has 4 divisors (see below), whose sum is σ = 121437832. Its totient is φ = 120582072.

The previous prime is 121009949. The next prime is 121009963. The reversal of 121009951 is 159900121.

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 121009951 - 2¹ = 121009949 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 (121009981) 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, 213516 + ... + 214081.

It is an arithmetic number, because the mean of its divisors is an integer number (30359458).

Almost surely, 2^121009951 is an apocalyptic number.

121009951 is a deficient number, since it is larger than the sum of its proper divisors (427881).

121009951 is an equidigital number, since it uses as much as digits as its factorization.

121009951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427880.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 121009951 is about 11000.4523088826. The cubic root of 121009951 is about 494.6223027731.

The spelling of 121009951 in words is "one hundred twenty-one million, nine thousand, nine hundred fifty-one".