641562533 has 2 divisors, whose sum is σ = 641562534. Its totient is φ = 641562532.

The previous prime is 641562517. The next prime is 641562539. The reversal of 641562533 is 335265146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553990369 + 87572164 = 23537^2 + 9358^2 .

It is a cyclic number.

It is not a de Polignac number, because 641562533 - 2⁴ = 641562517 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 641562493 and 641562502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641562539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320781266 + 320781267.

It is an arithmetic number, because the mean of its divisors is an integer number (320781267).

Almost surely, 2^641562533 is an apocalyptic number.

It is an amenable number.

641562533 is a deficient number, since it is larger than the sum of its proper divisors (1).

641562533 is an equidigital number, since it uses as much as digits as its factorization.

641562533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 35.

The square root of 641562533 is about 25329.0847248771. The cubic root of 641562533 is about 862.4746342187.

The spelling of 641562533 in words is "six hundred forty-one million, five hundred sixty-two thousand, five hundred thirty-three".