1861411807 has 2 divisors, whose sum is σ = 1861411808. Its totient is φ = 1861411806.

The previous prime is 1861411793. The next prime is 1861411813. The reversal of 1861411807 is 7081141681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861411807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861411837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930705903 + 930705904.

It is an arithmetic number, because the mean of its divisors is an integer number (930705904).

Almost surely, 2^1861411807 is an apocalyptic number.

1861411807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861411807 is an equidigital number, since it uses as much as digits as its factorization.

1861411807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 1861411807 is about 43144.0819464269. The cubic root of 1861411807 is about 1230.1200242009.

The spelling of 1861411807 in words is "one billion, eight hundred sixty-one million, four hundred eleven thousand, eight hundred seven".