1997081 has 2 divisors, whose sum is σ = 1997082. Its totient is φ = 1997080.

The previous prime is 1997059. The next prime is 1997087. The reversal of 1997081 is 1807991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1731856 + 265225 = 1316^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997081 - 2¹⁴ = 1980697 is a prime.

It is a super-2 number, since 2×1997081² = 7976665041122, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (1997087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998540 + 998541.

It is an arithmetic number, because the mean of its divisors is an integer number (998541).

2^1997081 is an apocalyptic number.

It is an amenable number.

1997081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997081 is an equidigital number, since it uses as much as digits as its factorization.

1997081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1997081 is about 1413.1811631918. The cubic root of 1997081 is about 125.9307799861.

The spelling of 1997081 in words is "one million, nine hundred ninety-seven thousand, eighty-one".