1872506491 has 2 divisors, whose sum is σ = 1872506492. Its totient is φ = 1872506490.

The previous prime is 1872506443. The next prime is 1872506513. The reversal of 1872506491 is 1946052781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1872506491 - 2¹¹ = 1872504443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1872506401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936253245 + 936253246.

It is an arithmetic number, because the mean of its divisors is an integer number (936253246).

Almost surely, 2^1872506491 is an apocalyptic number.

1872506491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872506491 is an equidigital number, since it uses as much as digits as its factorization.

1872506491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 1872506491 is about 43272.4680484023. The cubic root of 1872506491 is about 1232.5591704947.

The spelling of 1872506491 in words is "one billion, eight hundred seventy-two million, five hundred six thousand, four hundred ninety-one".