1815429137 has 2 divisors, whose sum is σ = 1815429138. Its totient is φ = 1815429136.

The previous prime is 1815429131. The next prime is 1815429139. The reversal of 1815429137 is 7319245181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1450771921 + 364657216 = 38089^2 + 19096^2 .

It is an emirp because it is prime and its reverse (7319245181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1815429137 - 2²² = 1811234833 is a prime.

Together with 1815429139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1815429094 and 1815429103.

It is not a weakly prime, because it can be changed into another prime (1815429131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907714568 + 907714569.

It is an arithmetic number, because the mean of its divisors is an integer number (907714569).

Almost surely, 2^1815429137 is an apocalyptic number.

It is an amenable number.

1815429137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815429137 is an equidigital number, since it uses as much as digits as its factorization.

1815429137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 1815429137 is about 42607.8529968362. The cubic root of 1815429137 is about 1219.9061866858.

The spelling of 1815429137 in words is "one billion, eight hundred fifteen million, four hundred twenty-nine thousand, one hundred thirty-seven".