987994252441 has 27 divisors (see below), whose sum is σ = 1158280026141. Its totient is φ = 840285991104.

The previous prime is 987994252433. The next prime is 987994252451. The reversal of 987994252441 is 144252499789.

The square root of 987994252441 is 993979.

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

It can be written as a sum of positive squares in 4 ways, for example, as 243922393225 + 744071859216 = 493885^2 + 862596^2 .

It is not a de Polignac number, because 987994252441 - 2³ = 987994252433 is a prime.

It is a super-2 number, since 2×987994252441² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (987994252451) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1036719621 + ... + 1036720573.

Almost surely, 2^987994252441 is an apocalyptic number.

987994252441 is the 993979-th square number.

987994252441 is the 496990-th centered octagonal number.

It is an amenable number.

987994252441 is a deficient number, since it is larger than the sum of its proper divisors (170285773700).

987994252441 is an frugal number, since it uses more digits than its factorization.

987994252441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218 (or 1109 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 64.

Multiplying 987994252441 by its sum of digits (64), we get a square (63231632156224 = 7951832²).

The spelling of 987994252441 in words is "nine hundred eighty-seven billion, nine hundred ninety-four million, two hundred fifty-two thousand, four hundred forty-one".