1538229961 has 2 divisors, whose sum is σ = 1538229962. Its totient is φ = 1538229960.

The previous prime is 1538229941. The next prime is 1538230003. The reversal of 1538229961 is 1699228351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 872847936 + 665382025 = 29544^2 + 25795^2 .

It is an emirp because it is prime and its reverse (1699228351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1538229961 - 2⁹ = 1538229449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1538229941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769114980 + 769114981.

It is an arithmetic number, because the mean of its divisors is an integer number (769114981).

Almost surely, 2^1538229961 is an apocalyptic number.

It is an amenable number.

1538229961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538229961 is an equidigital number, since it uses as much as digits as its factorization.

1538229961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 46.

The square root of 1538229961 is about 39220.2748715508. The cubic root of 1538229961 is about 1154.3577474167.

The spelling of 1538229961 in words is "one billion, five hundred thirty-eight million, two hundred twenty-nine thousand, nine hundred sixty-one".