1201681489 has 6 divisors (see below), whose sum is σ = 1241696850. Its totient is φ = 1162916640.

The previous prime is 1201681463. The next prime is 1201681501. The reversal of 1201681489 is 9841861021.

It can be written as a sum of positive squares in only one way, i.e., 724040464 + 477641025 = 26908^2 + 21855^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1201681489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201681409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 624264 + ... + 626185.

It is an arithmetic number, because the mean of its divisors is an integer number (206949475).

Almost surely, 2^1201681489 is an apocalyptic number.

It is an amenable number.

1201681489 is a deficient number, since it is larger than the sum of its proper divisors (40015361).

1201681489 is an equidigital number, since it uses as much as digits as its factorization.

1201681489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250511 (or 1250480 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1201681489 is about 34665.2778583989. The cubic root of 1201681489 is about 1063.1546843888.

The spelling of 1201681489 in words is "one billion, two hundred one million, six hundred eighty-one thousand, four hundred eighty-nine".