121549955 has 4 divisors (see below), whose sum is σ = 145859952. Its totient is φ = 97239960.

The previous prime is 121549951. The next prime is 121549957. The reversal of 121549955 is 559945121.

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

It is not a de Polignac number, because 121549955 - 2² = 121549951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121549951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12154991 + ... + 12155000.

It is an arithmetic number, because the mean of its divisors is an integer number (36464988).

Almost surely, 2^121549955 is an apocalyptic number.

121549955 is a deficient number, since it is larger than the sum of its proper divisors (24309997).

121549955 is an equidigital number, since it uses as much as digits as its factorization.

121549955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24309996.

The product of its digits is 81000, while the sum is 41.

The square root of 121549955 is about 11024.9696144706. The cubic root of 121549955 is about 495.3569577764.

The spelling of 121549955 in words is "one hundred twenty-one million, five hundred forty-nine thousand, nine hundred fifty-five".