155231945 has 48 divisors (see below), whose sum is σ = 220323456. Its totient is φ = 103910400.

The previous prime is 155231939. The next prime is 155231963. The reversal of 155231945 is 549132551.

It is a de Polignac number, because none of the positive numbers 2^k-155231945 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2126429 + ... + 2126501.

It is an arithmetic number, because the mean of its divisors is an integer number (4590072).

Almost surely, 2^155231945 is an apocalyptic number.

It is an amenable number.

155231945 is a deficient number, since it is larger than the sum of its proper divisors (65091511).

155231945 is a wasteful number, since it uses less digits than its factorization.

155231945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 153 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 155231945 is about 12459.2112511186. The cubic root of 155231945 is about 537.4363450848.

The spelling of 155231945 in words is "one hundred fifty-five million, two hundred thirty-one thousand, nine hundred forty-five".