1771325891 has 2 divisors, whose sum is σ = 1771325892. Its totient is φ = 1771325890.

The previous prime is 1771325851. The next prime is 1771325903. The reversal of 1771325891 is 1985231771.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1771325891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1771325851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 885662945 + 885662946.

It is an arithmetic number, because the mean of its divisors is an integer number (885662946).

Almost surely, 2^1771325891 is an apocalyptic number.

1771325891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1771325891 is an equidigital number, since it uses as much as digits as its factorization.

1771325891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 1771325891 is about 42087.1226267608. The cubic root of 1771325891 is about 1209.9464700951.

The spelling of 1771325891 in words is "one billion, seven hundred seventy-one million, three hundred twenty-five thousand, eight hundred ninety-one".