121953531 has 16 divisors (see below), whose sum is σ = 188985600. Its totient is φ = 68505888.

The previous prime is 121953527. The next prime is 121953551. The reversal of 121953531 is 135359121.

It is not a de Polignac number, because 121953531 - 2² = 121953527 is a prime.

It is a super-2 number, since 2×121953531² = 29745327446735922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121953511) 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 15 ways as a sum of consecutive naturals, for example, 47976 + ... + 50453.

It is an arithmetic number, because the mean of its divisors is an integer number (11811600).

Almost surely, 2^121953531 is an apocalyptic number.

121953531 is a deficient number, since it is larger than the sum of its proper divisors (67032069).

121953531 is an equidigital number, since it uses as much as digits as its factorization.

121953531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98498.

The product of its digits is 4050, while the sum is 30.

The square root of 121953531 is about 11043.2572640503. The cubic root of 121953531 is about 495.9045881230.

The spelling of 121953531 in words is "one hundred twenty-one million, nine hundred fifty-three thousand, five hundred thirty-one".