1861126511 has 2 divisors, whose sum is σ = 1861126512. Its totient is φ = 1861126510.

The previous prime is 1861126471. The next prime is 1861126541. The reversal of 1861126511 is 1156211681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1861126511 - 2¹⁴ = 1861110127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861126541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930563255 + 930563256.

It is an arithmetic number, because the mean of its divisors is an integer number (930563256).

Almost surely, 2^1861126511 is an apocalyptic number.

1861126511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861126511 is an equidigital number, since it uses as much as digits as its factorization.

1861126511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 32.

The square root of 1861126511 is about 43140.7755029972. The cubic root of 1861126511 is about 1230.0571747279.

The spelling of 1861126511 in words is "one billion, eight hundred sixty-one million, one hundred twenty-six thousand, five hundred eleven".