1977525047 has 4 divisors (see below), whose sum is σ = 2019600096. Its totient is φ = 1935450000.

The previous prime is 1977525037. The next prime is 1977525071. The reversal of 1977525047 is 7405257791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7405257791 = 77761 ⋅95231.

It is a cyclic number.

It is not a de Polignac number, because 1977525047 - 2¹⁰ = 1977524023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 42075001 = 1977525047 / (1 + 9 + 7 + 7 + 5 + 2 + 5 + 0 + 4 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1977524992 and 1977525010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977525037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21037454 + ... + 21037547.

It is an arithmetic number, because the mean of its divisors is an integer number (504900024).

Almost surely, 2^1977525047 is an apocalyptic number.

1977525047 is a deficient number, since it is larger than the sum of its proper divisors (42075049).

1977525047 is an equidigital number, since it uses as much as digits as its factorization.

1977525047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42075048.

The product of its (nonzero) digits is 617400, while the sum is 47.

The square root of 1977525047 is about 44469.3720104073. The cubic root of 1977525047 is about 1255.1838160835.

The spelling of 1977525047 in words is "one billion, nine hundred seventy-seven million, five hundred twenty-five thousand, forty-seven".