1531222165 has 32 divisors (see below), whose sum is σ = 2059997184. Its totient is φ = 1083090240.

The previous prime is 1531222073. The next prime is 1531222211. The reversal of 1531222165 is 5612221351.

It is not a de Polignac number, because 1531222165 - 2¹⁹ = 1530697877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429922 + ... + 433468.

It is an arithmetic number, because the mean of its divisors is an integer number (64374912).

Almost surely, 2^1531222165 is an apocalyptic number.

It is an amenable number.

1531222165 is a deficient number, since it is larger than the sum of its proper divisors (528775019).

1531222165 is a wasteful number, since it uses less digits than its factorization.

1531222165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777.

The product of its digits is 3600, while the sum is 28.

The square root of 1531222165 is about 39130.8339420463. The cubic root of 1531222165 is about 1152.6020889454.

The spelling of 1531222165 in words is "one billion, five hundred thirty-one million, two hundred twenty-two thousand, one hundred sixty-five".