1971214509 has 24 divisors (see below), whose sum is σ = 2911065696. Its totient is φ = 1185527200.

The previous prime is 1971214507. The next prime is 1971214513. The reversal of 1971214509 is 9054121791.

It is not a de Polignac number, because 1971214509 - 2¹ = 1971214507 is a prime.

It is a super-2 number, since 2×1971214509² = 7771373280984222162, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971214507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26827 + ... + 68279.

It is an arithmetic number, because the mean of its divisors is an integer number (121294404).

Almost surely, 2^1971214509 is an apocalyptic number.

It is an amenable number.

1971214509 is a deficient number, since it is larger than the sum of its proper divisors (939851187).

1971214509 is a wasteful number, since it uses less digits than its factorization.

1971214509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41609 (or 41598 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 1971214509 is about 44398.3615576071. The cubic root of 1971214509 is about 1253.8472420879.

The spelling of 1971214509 in words is "one billion, nine hundred seventy-one million, two hundred fourteen thousand, five hundred nine".