1671261587 has 2 divisors, whose sum is σ = 1671261588. Its totient is φ = 1671261586.

The previous prime is 1671261539. The next prime is 1671261589. The reversal of 1671261587 is 7851621761.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1671261587 - 2¹² = 1671257491 is a prime.

It is a super-3 number, since 3×1671261587³ (a number of 29 digits) contains 333 as substring.

Together with 1671261589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1671261589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835630793 + 835630794.

It is an arithmetic number, because the mean of its divisors is an integer number (835630794).

Almost surely, 2^1671261587 is an apocalyptic number.

1671261587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671261587 is an equidigital number, since it uses as much as digits as its factorization.

1671261587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 1671261587 is about 40881.0663632934. The cubic root of 1671261587 is about 1186.7196778157.

The spelling of 1671261587 in words is "one billion, six hundred seventy-one million, two hundred sixty-one thousand, five hundred eighty-seven".