1997285481 has 9 divisors (see below), whose sum is σ = 2885161591. Its totient is φ = 1331434272.

The previous prime is 1997285473. The next prime is 1997285527. The reversal of 1997285481 is 1845827991.

It is a happy number.

The square root of 1997285481 is 44691.

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

1997285481 is a `hidden beast` number, since 1 + 9 + 97 + 2 + 8 + 548 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1862354025 + 134931456 = 43155^2 + 11616^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1997285481 - 2³ = 1997285473 is a prime.

It is a super-2 number, since 2×1997285481² = 7978298585226802722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997285461) 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, 126625 + ... + 141521.

Almost surely, 2^1997285481 is an apocalyptic number.

1997285481 is the 44691-st square number.

1997285481 is the 22346-th centered octagonal number.

It is an amenable number.

1997285481 is a deficient number, since it is larger than the sum of its proper divisors (887876110).

1997285481 is an frugal number, since it uses more digits than its factorization.

1997285481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29800 (or 14900 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The cubic root of 1997285481 is about 1259.3507785435.

It can be divided in two parts, 199728 and 5481, that added together give a square (205209 = 453²).

The spelling of 1997285481 in words is "one billion, nine hundred ninety-seven million, two hundred eighty-five thousand, four hundred eighty-one".