900649 has 2 divisors, whose sum is σ = 900650. Its totient is φ = 900648.

The previous prime is 900623. The next prime is 900659. The reversal of 900649 is 946009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 186624 = 845^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 900649 - 2¹³ = 892457 is a prime.

It is a super-2 number, since 2×900649² = 1622337242402, which contains 22 as substring.

900649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (900659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450324 + 450325.

It is an arithmetic number, because the mean of its divisors is an integer number (450325).

2⁹⁰⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

900649 is a deficient number, since it is larger than the sum of its proper divisors (1).

900649 is an equidigital number, since it uses as much as digits as its factorization.

900649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 900649 is about 949.0252894418. The cubic root of 900649 is about 96.5721403885.

The spelling of 900649 in words is "nine hundred thousand, six hundred forty-nine".