1640376541 has 2 divisors, whose sum is σ = 1640376542. Its totient is φ = 1640376540.

The previous prime is 1640376539. The next prime is 1640376547. The reversal of 1640376541 is 1456730461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988850916 + 651525625 = 31446^2 + 25525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640376541 - 2¹ = 1640376539 is a prime.

Together with 1640376539, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1640376541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640376547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820188270 + 820188271.

It is an arithmetic number, because the mean of its divisors is an integer number (820188271).

Almost surely, 2^1640376541 is an apocalyptic number.

It is an amenable number.

1640376541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640376541 is an equidigital number, since it uses as much as digits as its factorization.

1640376541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1640376541 is about 40501.5622044385. The cubic root of 1640376541 is about 1179.3639541164.

The spelling of 1640376541 in words is "one billion, six hundred forty million, three hundred seventy-six thousand, five hundred forty-one".