121436531 has 4 divisors (see below), whose sum is σ = 122688552. Its totient is φ = 120184512.

The previous prime is 121436521. The next prime is 121436533. The reversal of 121436531 is 135634121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135634121 = 7 ⋅19376303.

It is a cyclic number.

It is not a de Polignac number, because 121436531 - 2²⁶ = 54327667 is a prime.

It is a super-2 number, since 2×121436531² = 29493662122627922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121436531.

It is not an unprimeable number, because it can be changed into a prime (121436533) 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, 625865 + ... + 626058.

It is an arithmetic number, because the mean of its divisors is an integer number (30672138).

Almost surely, 2^121436531 is an apocalyptic number.

121436531 is a deficient number, since it is larger than the sum of its proper divisors (1252021).

121436531 is an equidigital number, since it uses as much as digits as its factorization.

121436531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252020.

The product of its digits is 2160, while the sum is 26.

The square root of 121436531 is about 11019.8244541372. The cubic root of 121436531 is about 495.2028295059.

The spelling of 121436531 in words is "one hundred twenty-one million, four hundred thirty-six thousand, five hundred thirty-one".