1971081 has 16 divisors (see below), whose sum is σ = 3337600. Its totient is φ = 1126224.

The previous prime is 1971049. The next prime is 1971091. The reversal of 1971081 is 1801791.

It is not a de Polignac number, because 1971081 - 2⁵ = 1971049 is a prime.

It is a super-2 number, since 2×1971081² = 7770320617122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1971091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5026 + ... + 5403.

It is an arithmetic number, because the mean of its divisors is an integer number (208600).

2^1971081 is an apocalyptic number.

It is an amenable number.

1971081 is a deficient number, since it is larger than the sum of its proper divisors (1366519).

1971081 is a wasteful number, since it uses less digits than its factorization.

1971081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445 (or 10439 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1971081 is about 1403.9519222538. The cubic root of 1971081 is about 125.3818934046.

It can be divided in two parts, 19710 and 81, that added together give a palindrome (19791).

The spelling of 1971081 in words is "one million, nine hundred seventy-one thousand, eighty-one".