1977279349 has 2 divisors, whose sum is σ = 1977279350. Its totient is φ = 1977279348.

The previous prime is 1977279307. The next prime is 1977279377. The reversal of 1977279349 is 9439727791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1196468100 + 780811249 = 34590^2 + 27943^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977279349 - 2¹⁹ = 1976755061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977279293 and 1977279302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977279649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988639674 + 988639675.

It is an arithmetic number, because the mean of its divisors is an integer number (988639675).

Almost surely, 2^1977279349 is an apocalyptic number.

It is an amenable number.

1977279349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977279349 is an equidigital number, since it uses as much as digits as its factorization.

1977279349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6001128, while the sum is 58.

The square root of 1977279349 is about 44466.6093715273. The cubic root of 1977279349 is about 1255.1318304079.

The spelling of 1977279349 in words is "one billion, nine hundred seventy-seven million, two hundred seventy-nine thousand, three hundred forty-nine".