121552505 has 4 divisors (see below), whose sum is σ = 145863012. Its totient is φ = 97242000.

The previous prime is 121552489. The next prime is 121552507. The reversal of 121552505 is 505255121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21492496 + 100060009 = 4636^2 + 10003^2 .

It is not a de Polignac number, because 121552505 - 2⁴ = 121552489 is a prime.

It is a super-2 number, since 2×121552505² = 29550022943550050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121552507) 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 3 ways as a sum of consecutive naturals, for example, 12155246 + ... + 12155255.

It is an arithmetic number, because the mean of its divisors is an integer number (36465753).

Almost surely, 2^121552505 is an apocalyptic number.

It is an amenable number.

121552505 is a deficient number, since it is larger than the sum of its proper divisors (24310507).

121552505 is an equidigital number, since it uses as much as digits as its factorization.

121552505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24310506.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 121552505 is about 11025.0852604413. The cubic root of 121552505 is about 495.3604217882.

The spelling of 121552505 in words is "one hundred twenty-one million, five hundred fifty-two thousand, five hundred five".