1995121 has 2 divisors, whose sum is σ = 1995122. Its totient is φ = 1995120.

The previous prime is 1995109. The next prime is 1995139. The reversal of 1995121 is 1215991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 318096 = 1295^2 + 564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1995121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1995121.

It is not a weakly prime, because it can be changed into another prime (1995221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997560 + 997561.

It is an arithmetic number, because the mean of its divisors is an integer number (997561).

2^1995121 is an apocalyptic number.

1995121 is the 816-th hex number.

It is an amenable number.

1995121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995121 is an equidigital number, since it uses as much as digits as its factorization.

1995121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 28.

The square root of 1995121 is about 1412.4875220688. The cubic root of 1995121 is about 125.8895689853.

It can be divided in two parts, 1995 and 121, that added together give a square (2116 = 46²).

The spelling of 1995121 in words is "one million, nine hundred ninety-five thousand, one hundred twenty-one".