1538231269 has 2 divisors, whose sum is σ = 1538231270. Its totient is φ = 1538231268.

The previous prime is 1538231263. The next prime is 1538231273. The reversal of 1538231269 is 9621328351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1479402369 + 58828900 = 38463^2 + 7670^2 .

It is an emirp because it is prime and its reverse (9621328351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1538231269 - 2¹⁷ = 1538100197 is a prime.

It is a super-2 number, since 2×1538231269² = 4732310873858700722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1538231263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769115634 + 769115635.

It is an arithmetic number, because the mean of its divisors is an integer number (769115635).

Almost surely, 2^1538231269 is an apocalyptic number.

It is an amenable number.

1538231269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538231269 is an equidigital number, since it uses as much as digits as its factorization.

1538231269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 1538231269 is about 39220.2915465961. The cubic root of 1538231269 is about 1154.3580746108.

The spelling of 1538231269 in words is "one billion, five hundred thirty-eight million, two hundred thirty-one thousand, two hundred sixty-nine".