1298504981 has 4 divisors (see below), whose sum is σ = 1320513600. Its totient is φ = 1276496364.

The previous prime is 1298504939. The next prime is 1298504989. The reversal of 1298504981 is 1894058921.

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: 1894058921 = 83 ⋅22819987.

It is a cyclic number.

It is not a de Polignac number, because 1298504981 - 2⁶ = 1298504917 is a prime.

It is a super-2 number, since 2×1298504981² = 3372230371363620722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298504989) 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, 11004221 + ... + 11004338.

It is an arithmetic number, because the mean of its divisors is an integer number (330128400).

Almost surely, 2^1298504981 is an apocalyptic number.

It is an amenable number.

1298504981 is a deficient number, since it is larger than the sum of its proper divisors (22008619).

1298504981 is an equidigital number, since it uses as much as digits as its factorization.

1298504981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22008618.

The product of its (nonzero) digits is 207360, while the sum is 47.

The square root of 1298504981 is about 36034.7746073151. The cubic root of 1298504981 is about 1090.9743499915.

The spelling of 1298504981 in words is "one billion, two hundred ninety-eight million, five hundred four thousand, nine hundred eighty-one".