1977562897 has 4 divisors (see below), whose sum is σ = 2001389040. Its totient is φ = 1953736756.

The previous prime is 1977562877. The next prime is 1977562907. The reversal of 1977562897 is 7982657791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7982657791 = 41959 ⋅190249.

It is a cyclic number.

It is not a de Polignac number, because 1977562897 - 2¹⁵ = 1977530129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977562877) 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 in 3 ways as a sum of consecutive naturals, for example, 11912947 + ... + 11913112.

It is an arithmetic number, because the mean of its divisors is an integer number (500347260).

Almost surely, 2^1977562897 is an apocalyptic number.

It is an amenable number.

1977562897 is a deficient number, since it is larger than the sum of its proper divisors (23826143).

1977562897 is an equidigital number, since it uses as much as digits as its factorization.

1977562897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23826142.

The product of its digits is 13335840, while the sum is 61.

The square root of 1977562897 is about 44469.7975821793. The cubic root of 1977562897 is about 1255.1918241412.

The spelling of 1977562897 in words is "one billion, nine hundred seventy-seven million, five hundred sixty-two thousand, eight hundred ninety-seven".