1851740819 has 2 divisors, whose sum is σ = 1851740820. Its totient is φ = 1851740818.

The previous prime is 1851740809. The next prime is 1851740843. The reversal of 1851740819 is 9180471581.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1851740819 is a prime.

It is a super-2 number, since 2×1851740819² = 6857888121501581522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1851740819.

It is not a weakly prime, because it can be changed into another prime (1851740809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925870409 + 925870410.

It is an arithmetic number, because the mean of its divisors is an integer number (925870410).

Almost surely, 2^1851740819 is an apocalyptic number.

1851740819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851740819 is an equidigital number, since it uses as much as digits as its factorization.

1851740819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 44.

The square root of 1851740819 is about 43031.8581866970. The cubic root of 1851740819 is about 1227.9859561449.

The spelling of 1851740819 in words is "one billion, eight hundred fifty-one million, seven hundred forty thousand, eight hundred nineteen".