121500531 has 6 divisors (see below), whose sum is σ = 175500780. Its totient is φ = 81000348.

The previous prime is 121500527. The next prime is 121500541. The reversal of 121500531 is 135005121.

It is not a de Polignac number, because 121500531 - 2² = 121500527 is a prime.

It is a super-2 number, since 2×121500531² = 29524758066563922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121500521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6750021 + ... + 6750038.

It is an arithmetic number, because the mean of its divisors is an integer number (29250130).

Almost surely, 2^121500531 is an apocalyptic number.

121500531 is a deficient number, since it is larger than the sum of its proper divisors (54000249).

121500531 is a wasteful number, since it uses less digits than its factorization.

121500531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13500065 (or 13500062 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 121500531 is about 11022.7279291471. The cubic root of 121500531 is about 495.2898088654.

Adding to 121500531 its reverse (135005121), we get a palindrome (256505652).

The spelling of 121500531 in words is "one hundred twenty-one million, five hundred thousand, five hundred thirty-one".