121465 has 8 divisors (see below), whose sum is σ = 154440. Its totient is φ = 91392.

The previous prime is 121453. The next prime is 121469. The reversal of 121465 is 564121.

121465 = T₅ + T₆ + ... + T₈₉.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 116281 = 72^2 + 341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121465 - 2¹¹ = 119417 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (19305).

It is a Poulet number, since it divides 2¹²¹⁴⁶⁴-1.

2¹²¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

121465 is a deficient number, since it is larger than the sum of its proper divisors (32975).

121465 is a wasteful number, since it uses less digits than its factorization.

121465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its digits is 240, while the sum is 19.

The square root of 121465 is about 348.5182922029. The cubic root of 121465 is about 49.5241524144.

Adding to 121465 its reverse (564121), we get a palindrome (685586).

It can be divided in two parts, 121 and 465, that multiplied together give a palindrome (56265).

The spelling of 121465 in words is "one hundred twenty-one thousand, four hundred sixty-five".