155678791 has 4 divisors (see below), whose sum is σ = 159299272. Its totient is φ = 152058312.

The previous prime is 155678773. The next prime is 155678797. The reversal of 155678791 is 197876551.

It is a happy number.

155678791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197876551 = 2833 ⋅69847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155678791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155678797) 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, 1810176 + ... + 1810261.

It is an arithmetic number, because the mean of its divisors is an integer number (39824818).

Almost surely, 2^155678791 is an apocalyptic number.

155678791 is a deficient number, since it is larger than the sum of its proper divisors (3620481).

155678791 is an equidigital number, since it uses as much as digits as its factorization.

155678791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620480.

The product of its digits is 529200, while the sum is 49.

The square root of 155678791 is about 12477.1307198410. The cubic root of 155678791 is about 537.9515337554.

The spelling of 155678791 in words is "one hundred fifty-five million, six hundred seventy-eight thousand, seven hundred ninety-one".