1971115 has 4 divisors (see below), whose sum is σ = 2365344. Its totient is φ = 1576888.

The previous prime is 1971107. The next prime is 1971119. The reversal of 1971115 is 5111791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1971115 - 2³ = 1971107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1971115.

It is not an unprimeable number, because it can be changed into a prime (1971119) 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, 197107 + ... + 197116.

It is an arithmetic number, because the mean of its divisors is an integer number (591336).

2^1971115 is an apocalyptic number.

1971115 is a deficient number, since it is larger than the sum of its proper divisors (394229).

1971115 is an equidigital number, since it uses as much as digits as its factorization.

1971115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394228.

The product of its digits is 315, while the sum is 25.

The square root of 1971115 is about 1403.9640308783. The cubic root of 1971115 is about 125.3826143220.

The spelling of 1971115 in words is "one million, nine hundred seventy-one thousand, one hundred fifteen".