1648021253 has 2 divisors, whose sum is σ = 1648021254. Its totient is φ = 1648021252.

The previous prime is 1648021241. The next prime is 1648021261. The reversal of 1648021253 is 3521208461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969575044 + 678446209 = 31138^2 + 26047^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648021253 - 2²² = 1643826949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648021213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824010626 + 824010627.

It is an arithmetic number, because the mean of its divisors is an integer number (824010627).

Almost surely, 2^1648021253 is an apocalyptic number.

It is an amenable number.

1648021253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648021253 is an equidigital number, since it uses as much as digits as its factorization.

1648021253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1648021253 is about 40595.8280245643. The cubic root of 1648021253 is about 1181.1931943307.

The spelling of 1648021253 in words is "one billion, six hundred forty-eight million, twenty-one thousand, two hundred fifty-three".