1971357136 has 40 divisors (see below), whose sum is σ = 4367986304. Its totient is φ = 844318080.

The previous prime is 1971357127. The next prime is 1971357149. The reversal of 1971357136 is 6317531791.

It is a junction number, because it is equal to n+sod(n) for n = 1971357092 and 1971357101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200266 + ... + 209878.

Almost surely, 2^1971357136 is an apocalyptic number.

1971357136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1971357136 is an abundant number, since it is smaller than the sum of its proper divisors (2396629168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1971357136 is a wasteful number, since it uses less digits than its factorization.

1971357136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459 (or 11453 counting only the distinct ones).

The product of its digits is 119070, while the sum is 43.

The square root of 1971357136 is about 44399.9677477360. The cubic root of 1971357136 is about 1253.8774820165.

The spelling of 1971357136 in words is "one billion, nine hundred seventy-one million, three hundred fifty-seven thousand, one hundred thirty-six".