1557121006 has 16 divisors (see below), whose sum is σ = 2683330560. Its totient is φ = 663842520.

The previous prime is 1557120989. The next prime is 1557121009. The reversal of 1557121006 is 6001217551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557121009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288486 + ... + 293833.

It is an arithmetic number, because the mean of its divisors is an integer number (167708160).

Almost surely, 2^1557121006 is an apocalyptic number.

1557121006 is a deficient number, since it is larger than the sum of its proper divisors (1126209554).

1557121006 is a wasteful number, since it uses less digits than its factorization.

1557121006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582519.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1557121006 is about 39460.3726034106. The cubic root of 1557121006 is about 1159.0640999447.

Adding to 1557121006 its reverse (6001217551), we get a palindrome (7558338557).

The spelling of 1557121006 in words is "one billion, five hundred fifty-seven million, one hundred twenty-one thousand, six".