1643937131 has 2 divisors, whose sum is σ = 1643937132. Its totient is φ = 1643937130.

The previous prime is 1643937103. The next prime is 1643937143. The reversal of 1643937131 is 1317393461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1643937131 - 2¹⁸ = 1643674987 is a prime.

It is a super-2 number, since 2×1643937131² = 5405058581361022322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1643937331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821968565 + 821968566.

It is an arithmetic number, because the mean of its divisors is an integer number (821968566).

Almost surely, 2^1643937131 is an apocalyptic number.

1643937131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643937131 is an equidigital number, since it uses as much as digits as its factorization.

1643937131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 1643937131 is about 40545.4945832456. The cubic root of 1643937131 is about 1180.2166438862.

The spelling of 1643937131 in words is "one billion, six hundred forty-three million, nine hundred thirty-seven thousand, one hundred thirty-one".