1971887049 has 24 divisors (see below), whose sum is σ = 3108705600. Its totient is φ = 1194510240.

The previous prime is 1971887041. The next prime is 1971887081. The reversal of 1971887049 is 9407881791.

It is not a de Polignac number, because 1971887049 - 2³ = 1971887041 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1971886986 and 1971887004.

It is not an unprimeable number, because it can be changed into a prime (1971887041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301587 + ... + 308055.

It is an arithmetic number, because the mean of its divisors is an integer number (129529400).

Almost surely, 2^1971887049 is an apocalyptic number.

It is an amenable number.

1971887049 is a deficient number, since it is larger than the sum of its proper divisors (1136818551).

1971887049 is a wasteful number, since it uses less digits than its factorization.

1971887049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9565 (or 9562 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1971887049 is about 44405.9348398387. The cubic root of 1971887049 is about 1253.9898219605.

The spelling of 1971887049 in words is "one billion, nine hundred seventy-one million, eight hundred eighty-seven thousand, forty-nine".