900880781 has 2 divisors, whose sum is σ = 900880782. Its totient is φ = 900880780.

The previous prime is 900880777. The next prime is 900880787. The reversal of 900880781 is 187088009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678602500 + 222278281 = 26050^2 + 14909^2 .

It is a cyclic number.

It is not a de Polignac number, because 900880781 - 2² = 900880777 is a prime.

It is a super-2 number, since 2×900880781² = 1623172363150339922, 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 (900880787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450440390 + 450440391.

It is an arithmetic number, because the mean of its divisors is an integer number (450440391).

Almost surely, 2^900880781 is an apocalyptic number.

It is an amenable number.

900880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

900880781 is an equidigital number, since it uses as much as digits as its factorization.

900880781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 900880781 is about 30014.6760935380. The cubic root of 900880781 is about 965.8042392160.

The spelling of 900880781 in words is "nine hundred million, eight hundred eighty thousand, seven hundred eighty-one".