1650691541 has 2 divisors, whose sum is σ = 1650691542. Its totient is φ = 1650691540.

The previous prime is 1650691487. The next prime is 1650691543. The reversal of 1650691541 is 1451960561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 971880625 + 678810916 = 31175^2 + 26054^2 .

It is an emirp because it is prime and its reverse (1451960561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1650691541 is a prime.

It is a Sophie Germain prime.

Together with 1650691543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1650691495 and 1650691504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1650691543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825345770 + 825345771.

It is an arithmetic number, because the mean of its divisors is an integer number (825345771).

Almost surely, 2^1650691541 is an apocalyptic number.

It is an amenable number.

1650691541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650691541 is an equidigital number, since it uses as much as digits as its factorization.

1650691541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1650691541 is about 40628.7034127352. The cubic root of 1650691541 is about 1181.8308123217.

The spelling of 1650691541 in words is "one billion, six hundred fifty million, six hundred ninety-one thousand, five hundred forty-one".