1542231665 has 12 divisors (see below), whose sum is σ = 1993447092. Its totient is φ = 1138644960.

The previous prime is 1542231659. The next prime is 1542231671. The reversal of 1542231665 is 5661322451.

It is an interprime number because it is at equal distance from previous prime (1542231659) and next prime (1542231671).

It can be written as a sum of positive squares in 2 ways, for example, as 379626256 + 1162605409 = 19484^2 + 34097^2 .

It is not a de Polignac number, because 1542231665 - 2⁸ = 1542231409 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314180 + ... + 319050.

It is an arithmetic number, because the mean of its divisors is an integer number (166120591).

Almost surely, 2^1542231665 is an apocalyptic number.

It is an amenable number.

1542231665 is a deficient number, since it is larger than the sum of its proper divisors (451215427).

1542231665 is an frugal number, since it uses more digits than its factorization.

1542231665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760 (or 4889 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 1542231665 is about 39271.2574919622. The cubic root of 1542231665 is about 1155.3579008669.

The spelling of 1542231665 in words is "one billion, five hundred forty-two million, two hundred thirty-one thousand, six hundred sixty-five".