155681494 has 4 divisors (see below), whose sum is σ = 233522244. Its totient is φ = 77840746.

The previous prime is 155681467. The next prime is 155681507. The reversal of 155681494 is 494186551.

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

It is a self number, because there is not a number n which added to its sum of digits gives 155681494.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 38920372 + ... + 38920375.

It is an arithmetic number, because the mean of its divisors is an integer number (58380561).

Almost surely, 2^155681494 is an apocalyptic number.

155681494 is a deficient number, since it is larger than the sum of its proper divisors (77840750).

155681494 is an equidigital number, since it uses as much as digits as its factorization.

155681494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77840749.

The product of its digits is 172800, while the sum is 43.

The square root of 155681494 is about 12477.2390375435. The cubic root of 155681494 is about 537.9546471629.

The spelling of 155681494 in words is "one hundred fifty-five million, six hundred eighty-one thousand, four hundred ninety-four".