1813120957 has 2 divisors, whose sum is σ = 1813120958. Its totient is φ = 1813120956.

The previous prime is 1813120943. The next prime is 1813121003. The reversal of 1813120957 is 7590213181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1442404441 + 370716516 = 37979^2 + 19254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813120957 - 2²⁷ = 1678903229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813123957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906560478 + 906560479.

It is an arithmetic number, because the mean of its divisors is an integer number (906560479).

Almost surely, 2^1813120957 is an apocalyptic number.

It is an amenable number.

1813120957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813120957 is an equidigital number, since it uses as much as digits as its factorization.

1813120957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1813120957 is about 42580.7580604197. The cubic root of 1813120957 is about 1219.3889614577.

The spelling of 1813120957 in words is "one billion, eight hundred thirteen million, one hundred twenty thousand, nine hundred fifty-seven".