1301781989 has 4 divisors (see below), whose sum is σ = 1336965324. Its totient is φ = 1266598656.

The previous prime is 1301781973. The next prime is 1301781997. The reversal of 1301781989 is 9891871031.

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 1021889089 + 279892900 = 31967^2 + 16730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1301781989 - 2⁴ = 1301781973 is a prime.

It is a super-2 number, since 2×1301781989² = 3389272693769592242, 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 (1301781589) 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, 17591612 + ... + 17591685.

It is an arithmetic number, because the mean of its divisors is an integer number (334241331).

Almost surely, 2^1301781989 is an apocalyptic number.

It is an amenable number.

1301781989 is a deficient number, since it is larger than the sum of its proper divisors (35183335).

1301781989 is an equidigital number, since it uses as much as digits as its factorization.

1301781989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35183334.

The product of its (nonzero) digits is 108864, while the sum is 47.

The square root of 1301781989 is about 36080.2160331670. The cubic root of 1301781989 is about 1091.8913348937.

The spelling of 1301781989 in words is "one billion, three hundred one million, seven hundred eighty-one thousand, nine hundred eighty-nine".