1977061253 has 2 divisors, whose sum is σ = 1977061254. Its totient is φ = 1977061252.

The previous prime is 1977061213. The next prime is 1977061277. The reversal of 1977061253 is 3521607791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141966849 + 835094404 = 33793^2 + 28898^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977061253 - 2²⁰ = 1976012677 is a prime.

It is a super-2 number, since 2×1977061253² = 7817542396227860018, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977061253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977061213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988530626 + 988530627.

It is an arithmetic number, because the mean of its divisors is an integer number (988530627).

Almost surely, 2^1977061253 is an apocalyptic number.

It is an amenable number.

1977061253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977061253 is an equidigital number, since it uses as much as digits as its factorization.

1977061253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1977061253 is about 44464.1569469162. The cubic root of 1977061253 is about 1255.0856812557.

The spelling of 1977061253 in words is "one billion, nine hundred seventy-seven million, sixty-one thousand, two hundred fifty-three".