1617643253 has 2 divisors, whose sum is σ = 1617643254. Its totient is φ = 1617643252.

The previous prime is 1617643217. The next prime is 1617643277. The reversal of 1617643253 is 3523467161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1093095844 + 524547409 = 33062^2 + 22903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617643253 - 2²⁰ = 1616594677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1617643213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808821626 + 808821627.

It is an arithmetic number, because the mean of its divisors is an integer number (808821627).

Almost surely, 2^1617643253 is an apocalyptic number.

It is an amenable number.

1617643253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617643253 is an equidigital number, since it uses as much as digits as its factorization.

1617643253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 1617643253 is about 40219.9360143698. The cubic root of 1617643253 is about 1173.8904880112.

It can be divided in two parts, 16176 and 43253, that multiplied together give a triangular number (699660528 = T₃₇₄₀₇).

The spelling of 1617643253 in words is "one billion, six hundred seventeen million, six hundred forty-three thousand, two hundred fifty-three".