900287981 has 2 divisors, whose sum is σ = 900287982. Its totient is φ = 900287980.

The previous prime is 900287953. The next prime is 900288013. The reversal of 900287981 is 189782009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884527081 + 15760900 = 29741^2 + 3970^2 .

It is an emirp because it is prime and its reverse (189782009) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900287981 is a prime.

It is a super-2 number, since 2×900287981² = 1621036897466112722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900289981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450143990 + 450143991.

It is an arithmetic number, because the mean of its divisors is an integer number (450143991).

Almost surely, 2^900287981 is an apocalyptic number.

It is an amenable number.

900287981 is a deficient number, since it is larger than the sum of its proper divisors (1).

900287981 is an equidigital number, since it uses as much as digits as its factorization.

900287981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 900287981 is about 30004.7992994454. The cubic root of 900287981 is about 965.5923523641.

The spelling of 900287981 in words is "nine hundred million, two hundred eighty-seven thousand, nine hundred eighty-one".