1551090729 has 16 divisors (see below), whose sum is σ = 2081965248. Its totient is φ = 1027156032.

The previous prime is 1551090683. The next prime is 1551090731. The reversal of 1551090729 is 9270901551.

It is not a de Polignac number, because 1551090729 - 2¹² = 1551086633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1551090769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445654 + ... + 449120.

It is an arithmetic number, because the mean of its divisors is an integer number (130122828).

Almost surely, 2^1551090729 is an apocalyptic number.

It is an amenable number.

1551090729 is a deficient number, since it is larger than the sum of its proper divisors (530874519).

1551090729 is a wasteful number, since it uses less digits than its factorization.

1551090729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424.

The product of its (nonzero) digits is 28350, while the sum is 39.

The square root of 1551090729 is about 39383.8892061208. The cubic root of 1551090729 is about 1157.5659248387.

The spelling of 1551090729 in words is "one billion, five hundred fifty-one million, ninety thousand, seven hundred twenty-nine".