2155951 has 12 divisors (see below), whose sum is σ = 2618352. Its totient is φ = 1766688.

The previous prime is 2155931. The next prime is 2155961. The reversal of 2155951 is 1595512.

It is not a de Polignac number, because 2155951 - 2¹¹ = 2153903 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (218196).

2^2155951 is an apocalyptic number.

2155951 is a deficient number, since it is larger than the sum of its proper divisors (462401).

2155951 is a wasteful number, since it uses less digits than its factorization.

2155951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950 (or 1943 counting only the distinct ones).

The product of its digits is 2250, while the sum is 28.

The square root of 2155951 is about 1468.3157017481. The cubic root of 2155951 is about 129.1852595273.

The spelling of 2155951 in words is "two million, one hundred fifty-five thousand, nine hundred fifty-one".