980521965 has 12 divisors (see below), whose sum is σ = 1699571484. Its totient is φ = 522945024.

The previous prime is 980521951. The next prime is 980521967. The reversal of 980521965 is 569125089.

It can be written as a sum of positive squares in 2 ways, for example, as 751362921 + 229159044 = 27411^2 + 15138^2 .

It is not a de Polignac number, because 980521965 - 2⁵ = 980521933 is a prime.

It is a super-2 number, since 2×980521965² = 1922846647694922450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 21789377 = 980521965 / (9 + 8 + 0 + 5 + 2 + 1 + 9 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 980521965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (980521967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10894644 + ... + 10894733.

It is an arithmetic number, because the mean of its divisors is an integer number (141630957).

Almost surely, 2^980521965 is an apocalyptic number.

It is an amenable number.

980521965 is a deficient number, since it is larger than the sum of its proper divisors (719049519).

980521965 is a wasteful number, since it uses less digits than its factorization.

980521965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21789388 (or 21789385 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 980521965 is about 31313.2873553704. The cubic root of 980521965 is about 993.4647046220.

The spelling of 980521965 in words is "nine hundred eighty million, five hundred twenty-one thousand, nine hundred sixty-five".