1979249771 has 2 divisors, whose sum is σ = 1979249772. Its totient is φ = 1979249770.

The previous prime is 1979249689. The next prime is 1979249849. The reversal of 1979249771 is 1779429791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979249771 is a prime.

It is a super-4 number, since 4×1979249771⁴ (a number of 38 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1979249471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989624885 + 989624886.

It is an arithmetic number, because the mean of its divisors is an integer number (989624886).

Almost surely, 2^1979249771 is an apocalyptic number.

1979249771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979249771 is an equidigital number, since it uses as much as digits as its factorization.

1979249771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 56.

The square root of 1979249771 is about 44488.7600523998. The cubic root of 1979249771 is about 1255.5486183050.

The spelling of 1979249771 in words is "one billion, nine hundred seventy-nine million, two hundred forty-nine thousand, seven hundred seventy-one".