1555654157 has 2 divisors, whose sum is σ = 1555654158. Its totient is φ = 1555654156.

The previous prime is 1555654123. The next prime is 1555654171. The reversal of 1555654157 is 7514565551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1471949956 + 83704201 = 38366^2 + 9149^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555654157 - 2¹⁴ = 1555637773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555654187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777827078 + 777827079.

It is an arithmetic number, because the mean of its divisors is an integer number (777827079).

Almost surely, 2^1555654157 is an apocalyptic number.

It is an amenable number.

1555654157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555654157 is an equidigital number, since it uses as much as digits as its factorization.

1555654157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 525000, while the sum is 44.

The square root of 1555654157 is about 39441.7818689775. The cubic root of 1555654157 is about 1158.7000292960.

The spelling of 1555654157 in words is "one billion, five hundred fifty-five million, six hundred fifty-four thousand, one hundred fifty-seven".