1851973061 has 2 divisors, whose sum is σ = 1851973062. Its totient is φ = 1851973060.

The previous prime is 1851973051. The next prime is 1851973127. The reversal of 1851973061 is 1603791581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1437850561 + 414122500 = 37919^2 + 20350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851973061 - 2¹⁰ = 1851972037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851973021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925986530 + 925986531.

It is an arithmetic number, because the mean of its divisors is an integer number (925986531).

Almost surely, 2^1851973061 is an apocalyptic number.

It is an amenable number.

1851973061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851973061 is an equidigital number, since it uses as much as digits as its factorization.

1851973061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 1851973061 is about 43034.5565911861. The cubic root of 1851973061 is about 1228.0372912615.

The spelling of 1851973061 in words is "one billion, eight hundred fifty-one million, nine hundred seventy-three thousand, sixty-one".