155461491 has 16 divisors (see below), whose sum is σ = 230507520. Its totient is φ = 103553640.

The previous prime is 155461487. The next prime is 155461511. The reversal of 155461491 is 194164551.

155461491 is a `hidden beast` number, since 1 + 554 + 6 + 14 + 91 = 666.

It is not a de Polignac number, because 155461491 - 2² = 155461487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155461441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54306 + ... + 57096.

It is an arithmetic number, because the mean of its divisors is an integer number (14406720).

Almost surely, 2^155461491 is an apocalyptic number.

155461491 is a deficient number, since it is larger than the sum of its proper divisors (75046029).

155461491 is a wasteful number, since it uses less digits than its factorization.

155461491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4863 (or 4857 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 155461491 is about 12468.4197475061. The cubic root of 155461491 is about 537.7011222106.

The spelling of 155461491 in words is "one hundred fifty-five million, four hundred sixty-one thousand, four hundred ninety-one".