1955091 has 4 divisors (see below), whose sum is σ = 2606792. Its totient is φ = 1303392.

The previous prime is 1955071. The next prime is 1955099. The reversal of 1955091 is 1905591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905591 = 3 ⋅635197.

It is not a de Polignac number, because 1955091 - 2⁶ = 1955027 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1955099) 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, 325846 + ... + 325851.

It is an arithmetic number, because the mean of its divisors is an integer number (651698).

2^1955091 is an apocalyptic number.

1955091 is a deficient number, since it is larger than the sum of its proper divisors (651701).

1955091 is an equidigital number, since it uses as much as digits as its factorization.

1955091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651700.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 1955091 is about 1398.2456865658. The cubic root of 1955091 is about 125.0419272686.

The spelling of 1955091 in words is "one million, nine hundred fifty-five thousand, ninety-one".