1971000249 has 32 divisors (see below), whose sum is σ = 2839019520. Its totient is φ = 1213071552.

The previous prime is 1971000233. The next prime is 1971000287. The reversal of 1971000249 is 9420001791.

It is not a de Polignac number, because 1971000249 - 2⁴ = 1971000233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971000209) 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 31 ways as a sum of consecutive naturals, for example, 321192 + ... + 327270.

It is an arithmetic number, because the mean of its divisors is an integer number (88719360).

Almost surely, 2^1971000249 is an apocalyptic number.

It is an amenable number.

1971000249 is a deficient number, since it is larger than the sum of its proper divisors (868019271).

1971000249 is a wasteful number, since it uses less digits than its factorization.

1971000249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6269.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 1971000249 is about 44395.9485651563. The cubic root of 1971000249 is about 1253.8018117127.

The spelling of 1971000249 in words is "one billion, nine hundred seventy-one million, two hundred forty-nine", and thus it is an aban number.