121201531 has 4 divisors (see below), whose sum is σ = 132219864. Its totient is φ = 110183200.

The previous prime is 121201523. The next prime is 121201541. The reversal of 121201531 is 135102121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121201531 - 2³ = 121201523 is a prime.

It is a super-2 number, since 2×121201531² = 29379622233487922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121201541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5509150 + ... + 5509171.

It is an arithmetic number, because the mean of its divisors is an integer number (33054966).

Almost surely, 2^121201531 is an apocalyptic number.

121201531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121201531 is a deficient number, since it is larger than the sum of its proper divisors (11018333).

121201531 is a wasteful number, since it uses less digits than its factorization.

121201531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018332.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 121201531 is about 11009.1566888659. The cubic root of 121201531 is about 494.8831897960.

Adding to 121201531 its reverse (135102121), we get a palindrome (256303652).

The spelling of 121201531 in words is "one hundred twenty-one million, two hundred one thousand, five hundred thirty-one".