1555135197 has 144 divisors (see below), whose sum is σ = 2903826240. Its totient is φ = 734469120.

The previous prime is 1555135189. The next prime is 1555135217. The reversal of 1555135197 is 7915315551.

It is not a de Polignac number, because 1555135197 - 2³ = 1555135189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555135117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 11187954 + ... + 11188092.

It is an arithmetic number, because the mean of its divisors is an integer number (20165460).

Almost surely, 2^1555135197 is an apocalyptic number.

1555135197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1555135197 is a deficient number, since it is larger than the sum of its proper divisors (1348691043).

1555135197 is a wasteful number, since it uses less digits than its factorization.

1555135197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 214 counting only the distinct ones).

The product of its digits is 118125, while the sum is 42.

The square root of 1555135197 is about 39435.2025099403. The cubic root of 1555135197 is about 1158.5711690685.

The spelling of 1555135197 in words is "one billion, five hundred fifty-five million, one hundred thirty-five thousand, one hundred ninety-seven".