1971501 has 16 divisors (see below), whose sum is σ = 3024000. Its totient is φ = 1119168.

The previous prime is 1971481. The next prime is 1971503. The reversal of 1971501 is 1051791.

1971501 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 1971501 - 2⁵ = 1971469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5475 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

2^1971501 is an apocalyptic number.

It is an amenable number.

1971501 is a deficient number, since it is larger than the sum of its proper divisors (1052499).

1971501 is a wasteful number, since it uses less digits than its factorization.

1971501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 315, while the sum is 24.

The square root of 1971501 is about 1404.1014920582. The cubic root of 1971501 is about 125.3907982737.

The spelling of 1971501 in words is "one million, nine hundred seventy-one thousand, five hundred one".