1642552591 has 2 divisors, whose sum is σ = 1642552592. Its totient is φ = 1642552590.

The previous prime is 1642552573. The next prime is 1642552601. The reversal of 1642552591 is 1952552461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642552591 - 2⁵ = 1642552559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642552091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821276295 + 821276296.

It is an arithmetic number, because the mean of its divisors is an integer number (821276296).

Almost surely, 2^1642552591 is an apocalyptic number.

1642552591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642552591 is an equidigital number, since it uses as much as digits as its factorization.

1642552591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 40.

The square root of 1642552591 is about 40528.4170798713. The cubic root of 1642552591 is about 1179.8852208093.

The spelling of 1642552591 in words is "one billion, six hundred forty-two million, five hundred fifty-two thousand, five hundred ninety-one".