145121655 has 32 divisors (see below), whose sum is σ = 274521600. Its totient is φ = 64052352.

The previous prime is 145121653. The next prime is 145121681. The reversal of 145121655 is 556121541.

145121655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145121655 - 2¹ = 145121653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145121653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20785 + ... + 26874.

It is an arithmetic number, because the mean of its divisors is an integer number (8578800).

Almost surely, 2^145121655 is an apocalyptic number.

145121655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145121655 is a deficient number, since it is larger than the sum of its proper divisors (129399945).

145121655 is a wasteful number, since it uses less digits than its factorization.

145121655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47703.

The product of its digits is 6000, while the sum is 30.

The square root of 145121655 is about 12046.6449686209. The cubic root of 145121655 is about 525.5056715191.

The spelling of 145121655 in words is "one hundred forty-five million, one hundred twenty-one thousand, six hundred fifty-five".