121540523 has 16 divisors (see below), whose sum is σ = 137728416. Its totient is φ = 106479360.

The previous prime is 121540513. The next prime is 121540541. The reversal of 121540523 is 325045121.

It is not a de Polignac number, because 121540523 - 2⁶ = 121540459 is a prime.

It is a super-2 number, since 2×121540523² = 29544197462227058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121540513) 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, 16640 + ... + 22802.

It is an arithmetic number, because the mean of its divisors is an integer number (8608026).

Almost surely, 2^121540523 is an apocalyptic number.

121540523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121540523 is a deficient number, since it is larger than the sum of its proper divisors (16187893).

121540523 is a wasteful number, since it uses less digits than its factorization.

121540523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6254.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 121540523 is about 11024.5418498911. The cubic root of 121540523 is about 495.3441445873.

Adding to 121540523 its reverse (325045121), we get a palindrome (446585644).

The spelling of 121540523 in words is "one hundred twenty-one million, five hundred forty thousand, five hundred twenty-three".