1555136413 has 2 divisors, whose sum is σ = 1555136414. Its totient is φ = 1555136412.

The previous prime is 1555136411. The next prime is 1555136459. The reversal of 1555136413 is 3146315551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276847289 + 278289124 = 35733^2 + 16682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555136413 - 2¹ = 1555136411 is a prime.

Together with 1555136411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555136411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777568206 + 777568207.

It is an arithmetic number, because the mean of its divisors is an integer number (777568207).

Almost surely, 2^1555136413 is an apocalyptic number.

It is an amenable number.

1555136413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555136413 is an equidigital number, since it uses as much as digits as its factorization.

1555136413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 1555136413 is about 39435.2179276342. The cubic root of 1555136413 is about 1158.5714710406.

The spelling of 1555136413 in words is "one billion, five hundred fifty-five million, one hundred thirty-six thousand, four hundred thirteen".