1371561671 has 2 divisors, whose sum is σ = 1371561672. Its totient is φ = 1371561670.

The previous prime is 1371561629. The next prime is 1371561673. The reversal of 1371561671 is 1761651731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1371561671 - 2¹⁰ = 1371560647 is a prime.

Together with 1371561673, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371561673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685780835 + 685780836.

It is an arithmetic number, because the mean of its divisors is an integer number (685780836).

Almost surely, 2^1371561671 is an apocalyptic number.

1371561671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371561671 is an equidigital number, since it uses as much as digits as its factorization.

1371561671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The square root of 1371561671 is about 37034.6009969056. The cubic root of 1371561671 is about 1111.0623897744.

The spelling of 1371561671 in words is "one billion, three hundred seventy-one million, five hundred sixty-one thousand, six hundred seventy-one".