121500431 has 4 divisors (see below), whose sum is σ = 130846632. Its totient is φ = 112154232.

The previous prime is 121500389. The next prime is 121500461. The reversal of 121500431 is 134005121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134005121 = 277 ⋅483773.

It is a cyclic number.

It is not a de Polignac number, because 121500431 - 2¹⁴ = 121484047 is a prime.

It is a super-2 number, since 2×121500431² = 29524709466371522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121500461) 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, 4673081 + ... + 4673106.

It is an arithmetic number, because the mean of its divisors is an integer number (32711658).

Almost surely, 2^121500431 is an apocalyptic number.

121500431 is a deficient number, since it is larger than the sum of its proper divisors (9346201).

121500431 is an equidigital number, since it uses as much as digits as its factorization.

121500431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346200.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 121500431 is about 11022.7233930640. The cubic root of 121500431 is about 495.2896729840.

Adding to 121500431 its reverse (134005121), we get a palindrome (255505552).

The spelling of 121500431 in words is "one hundred twenty-one million, five hundred thousand, four hundred thirty-one".