155951 has 4 divisors (see below), whose sum is σ = 156792. Its totient is φ = 155112.

The previous prime is 155921. The next prime is 156007. The reversal of 155951 is 159551.

155951 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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 155951 - 2⁶ = 155887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155921) 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, 5 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (39198).

2¹⁵⁵⁹⁵¹ is an apocalyptic number.

155951 is a deficient number, since it is larger than the sum of its proper divisors (841).

155951 is an equidigital number, since it uses as much as digits as its factorization.

155951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its digits is 1125, while the sum is 26.

The square root of 155951 is about 394.9063180047. The cubic root of 155951 is about 53.8264892610.

Subtracting 155951 from its reverse (159551), we obtain a square (3600 = 60²).

The spelling of 155951 in words is "one hundred fifty-five thousand, nine hundred fifty-one".