1530969981 has 4 divisors (see below), whose sum is σ = 2041293312. Its totient is φ = 1020646652.

The previous prime is 1530969977. The next prime is 1530970013. The reversal of 1530969981 is 1899690351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1530969981 - 2² = 1530969977 is a prime.

It is a super-2 number, since 2×1530969981² = 4687738165446280722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530969941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255161661 + ... + 255161666.

It is an arithmetic number, because the mean of its divisors is an integer number (510323328).

Almost surely, 2^1530969981 is an apocalyptic number.

It is an amenable number.

1530969981 is a deficient number, since it is larger than the sum of its proper divisors (510323331).

1530969981 is an equidigital number, since it uses as much as digits as its factorization.

1530969981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510323330.

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 1530969981 is about 39127.6114911197. The cubic root of 1530969981 is about 1152.5388096969.

The spelling of 1530969981 in words is "one billion, five hundred thirty million, nine hundred sixty-nine thousand, nine hundred eighty-one".