1555331157 has 12 divisors (see below), whose sum is σ = 2247121344. Its totient is φ = 1036641960.

The previous prime is 1555331147. The next prime is 1555331171. The reversal of 1555331157 is 7511335551.

1555331157 is a `hidden beast` number, since 1 + 5 + 5 + 533 + 115 + 7 = 666.

It is not a de Polignac number, because 1555331157 - 2¹¹ = 1555329109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555331147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24982 + ... + 61112.

It is an arithmetic number, because the mean of its divisors is an integer number (187260112).

Almost surely, 2^1555331157 is an apocalyptic number.

It is an amenable number.

1555331157 is a deficient number, since it is larger than the sum of its proper divisors (691790187).

1555331157 is a wasteful number, since it uses less digits than its factorization.

1555331157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40920 (or 40917 counting only the distinct ones).

The product of its digits is 39375, while the sum is 36.

The square root of 1555331157 is about 39437.6870138197. The cubic root of 1555331157 is about 1158.6198302334.

The spelling of 1555331157 in words is "one billion, five hundred fifty-five million, three hundred thirty-one thousand, one hundred fifty-seven".