121603531 has 8 divisors (see below), whose sum is σ = 139276800. Its totient is φ = 104005608.

The previous prime is 121603513. The next prime is 121603541. The reversal of 121603531 is 135306121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121603531 - 2⁹ = 121603019 is a prime.

It is a super-2 number, since 2×121603531² = 29574837503335922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121603511) 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 7 ways as a sum of consecutive naturals, for example, 15331 + ... + 21868.

It is an arithmetic number, because the mean of its divisors is an integer number (17409600).

Almost surely, 2^121603531 is an apocalyptic number.

121603531 is a deficient number, since it is larger than the sum of its proper divisors (17673269).

121603531 is an equidigital number, since it uses as much as digits as its factorization.

121603531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37673.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 121603531 is about 11027.3991040499. The cubic root of 121603531 is about 495.4297271605.

Adding to 121603531 its reverse (135306121), we get a palindrome (256909652).

The spelling of 121603531 in words is "one hundred twenty-one million, six hundred three thousand, five hundred thirty-one".