1957713381 has 20 divisors (see below), whose sum is σ = 3149447532. Its totient is φ = 1204746048.

The previous prime is 1957713347. The next prime is 1957713383. The reversal of 1957713381 is 1833177591.

1957713381 is a `hidden beast` number, since 195 + 77 + 13 + 381 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 936910881 + 1020802500 = 30609^2 + 31950^2 .

It is not a de Polignac number, because 1957713381 - 2¹⁹ = 1957189093 is a prime.

It is a super-2 number, since 2×1957713381² = 7665283364292902322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957713383) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 928536 + ... + 930641.

Almost surely, 2^1957713381 is an apocalyptic number.

It is an amenable number.

1957713381 is a deficient number, since it is larger than the sum of its proper divisors (1191734151).

1957713381 is a wasteful number, since it uses less digits than its factorization.

1957713381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859202 (or 1859193 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 1957713381 is about 44246.0549766869. The cubic root of 1957713381 is about 1250.9780890871.

The spelling of 1957713381 in words is "one billion, nine hundred fifty-seven million, seven hundred thirteen thousand, three hundred eighty-one".