1534782981 has 4 divisors (see below), whose sum is σ = 2046377312. Its totient is φ = 1023188652.

The previous prime is 1534782947. The next prime is 1534783009. The reversal of 1534782981 is 1892874351.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1892874351 = 3 ⋅630958117.

It is a de Polignac number, because none of the positive numbers 2^k-1534782981 is a prime.

It is a super-2 number, since 2×1534782981² = 4711117597534492722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1534782981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1534782911) 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, 255797161 + ... + 255797166.

It is an arithmetic number, because the mean of its divisors is an integer number (511594328).

Almost surely, 2^1534782981 is an apocalyptic number.

It is an amenable number.

1534782981 is a deficient number, since it is larger than the sum of its proper divisors (511594331).

1534782981 is an equidigital number, since it uses as much as digits as its factorization.

1534782981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511594330.

The product of its digits is 483840, while the sum is 48.

The square root of 1534782981 is about 39176.3063726023. The cubic root of 1534782981 is about 1153.4948456710.

The spelling of 1534782981 in words is "one billion, five hundred thirty-four million, seven hundred eighty-two thousand, nine hundred eighty-one".