1537238327921 has 2 divisors, whose sum is σ = 1537238327922. Its totient is φ = 1537238327920.

The previous prime is 1537238327857. The next prime is 1537238327939. The reversal of 1537238327921 is 1297238327351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1381414712896 + 155823615025 = 1175336^2 + 394745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1537238327921 - 2⁶ = 1537238327857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1537238827921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768619163960 + 768619163961.

It is an arithmetic number, because the mean of its divisors is an integer number (768619163961).

Almost surely, 2^{1537238327921} is an apocalyptic number.

It is an amenable number.

1537238327921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537238327921 is an equidigital number, since it uses as much as digits as its factorization.

1537238327921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 53.

The spelling of 1537238327921 in words is "one trillion, five hundred thirty-seven billion, two hundred thirty-eight million, three hundred twenty-seven thousand, nine hundred twenty-one".