1957384691 has 2 divisors, whose sum is σ = 1957384692. Its totient is φ = 1957384690.

The previous prime is 1957384657. The next prime is 1957384703. The reversal of 1957384691 is 1964837591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1957384691 - 2¹⁴ = 1957368307 is a prime.

It is a super-2 number, since 2×1957384691² = 7662709657122330962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1957384651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978692345 + 978692346.

It is an arithmetic number, because the mean of its divisors is an integer number (978692346).

Almost surely, 2^1957384691 is an apocalyptic number.

1957384691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957384691 is an equidigital number, since it uses as much as digits as its factorization.

1957384691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 1957384691 is about 44242.3404783246. The cubic root of 1957384691 is about 1250.9080742412.

Subtracting 1957384691 from its reverse (1964837591), we obtain a square (7452900 = 2730²).

The spelling of 1957384691 in words is "one billion, nine hundred fifty-seven million, three hundred eighty-four thousand, six hundred ninety-one".