1971097850 has 24 divisors (see below), whose sum is σ = 3670784028. Its totient is φ = 787462400.

The previous prime is 1971097847. The next prime is 1971097871. The reversal of 1971097850 is 587901791.

It can be written as a sum of positive squares in 6 ways, for example, as 224610169 + 1746487681 = 14987^2 + 41791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1971097795 and 1971097804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17042 + ... + 65058.

Almost surely, 2^1971097850 is an apocalyptic number.

1971097850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1971097850 is a deficient number, since it is larger than the sum of its proper divisors (1699686178).

1971097850 is a wasteful number, since it uses less digits than its factorization.

1971097850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48850 (or 48845 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 47.

The square root of 1971097850 is about 44397.0477622105. The cubic root of 1971097850 is about 1253.8225068379.

The spelling of 1971097850 in words is "one billion, nine hundred seventy-one million, ninety-seven thousand, eight hundred fifty".