121957 has 4 divisors (see below), whose sum is σ = 133056. Its totient is φ = 110860.

The previous prime is 121951. The next prime is 121963. The reversal of 121957 is 759121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759121 = 11 ⋅69011.

It is an interprime number because it is at equal distance from previous prime (121951) and next prime (121963).

It is a cyclic number.

It is not a de Polignac number, because 121957 - 2³ = 121949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121951) 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, 5533 + ... + 5554.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2¹²¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

121957 is a deficient number, since it is larger than the sum of its proper divisors (11099).

121957 is a wasteful number, since it uses less digits than its factorization.

121957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11098.

The product of its digits is 630, while the sum is 25.

The square root of 121957 is about 349.2234241857. The cubic root of 121957 is about 49.5909290123.

The spelling of 121957 in words is "one hundred twenty-one thousand, nine hundred fifty-seven".