121951 has 2 divisors, whose sum is σ = 121952. Its totient is φ = 121950.
The previous prime is 121949. The next prime is 121963. The reversal of 121951 is 159121.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 121951 - 21 = 121949 is a prime.
Together with 121949, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (121921) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60975 + 60976.
It is an arithmetic number, because the mean of its divisors is an integer number (60976).
2121951 is an apocalyptic number.
121951 is a deficient number, since it is larger than the sum of its proper divisors (1).
121951 is an equidigital number, since it uses as much as digits as its factorization.
121951 is an evil number, because the sum of its binary digits is even.
The product of its digits is 90, while the sum is 19.
The square root of 121951 is about 349.2148335910. The cubic root of 121951 is about 49.5901157463.
It can be divided in two parts, 1 and 21951, that added together give a cube (21952 = 283).
The spelling of 121951 in words is "one hundred twenty-one thousand, nine hundred fifty-one".
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