1641956737 has 2 divisors, whose sum is σ = 1641956738. Its totient is φ = 1641956736.

The previous prime is 1641956731. The next prime is 1641956741. The reversal of 1641956737 is 7376591461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307834896 + 334121841 = 36164^2 + 18279^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641956737 - 2¹¹ = 1641954689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641956731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820978368 + 820978369.

It is an arithmetic number, because the mean of its divisors is an integer number (820978369).

Almost surely, 2^1641956737 is an apocalyptic number.

It is an amenable number.

1641956737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641956737 is an equidigital number, since it uses as much as digits as its factorization.

1641956737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The square root of 1641956737 is about 40521.0653487788. The cubic root of 1641956737 is about 1179.7425314446.

The spelling of 1641956737 in words is "one billion, six hundred forty-one million, nine hundred fifty-six thousand, seven hundred thirty-seven".