1771989025 has 9 divisors (see below), whose sum is σ = 2197527411. Its totient is φ = 1417422840.

The previous prime is 1771989007. The next prime is 1771989029. The reversal of 1771989025 is 5209891771.

The square root of 1771989025 is 42095.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 637916049 + 1134072976 = 25257^2 + 33676^2 .

It is not a de Polignac number, because 1771989025 - 2¹⁷ = 1771857953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1771989025.

It is not an unprimeable number, because it can be changed into a prime (1771989029) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 206266 + ... + 214684.

Almost surely, 2^1771989025 is an apocalyptic number.

1771989025 is the 42095-th square number.

1771989025 is the 21048-th centered octagonal number.

It is an amenable number.

1771989025 is a deficient number, since it is larger than the sum of its proper divisors (425538386).

1771989025 is an frugal number, since it uses more digits than its factorization.

1771989025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16848 (or 8424 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 49.

The cubic root of 1771989025 is about 1210.0974410976.

Multiplying 1771989025 by its sum of digits (49), we get a square (86827462225 = 294665²).

The spelling of 1771989025 in words is "one billion, seven hundred seventy-one million, nine hundred eighty-nine thousand, twenty-five".