1541132981 has 4 divisors (see below), whose sum is σ = 1541724492. Its totient is φ = 1540541472.

The previous prime is 1541132951. The next prime is 1541133001. The reversal of 1541132981 is 1892311451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1488802225 + 52330756 = 38585^2 + 7234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1541132981 - 2¹⁴ = 1541116597 is a prime.

It is a super-2 number, since 2×1541132981² = 4750181730251892722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1541132911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291830 + ... + 297063.

It is an arithmetic number, because the mean of its divisors is an integer number (385431123).

Almost surely, 2^1541132981 is an apocalyptic number.

It is an amenable number.

1541132981 is a deficient number, since it is larger than the sum of its proper divisors (591511).

1541132981 is an equidigital number, since it uses as much as digits as its factorization.

1541132981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591510.

The product of its digits is 8640, while the sum is 35.

The square root of 1541132981 is about 39257.2666012294. The cubic root of 1541132981 is about 1155.0834771597.

The spelling of 1541132981 in words is "one billion, five hundred forty-one million, one hundred thirty-two thousand, nine hundred eighty-one".