1375121533 has 2 divisors, whose sum is σ = 1375121534. Its totient is φ = 1375121532.

The previous prime is 1375121453. The next prime is 1375121549. The reversal of 1375121533 is 3351215731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184598724 + 190522809 = 34418^2 + 13803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375121533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1375121495 and 1375121504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375121563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687560766 + 687560767.

It is an arithmetic number, because the mean of its divisors is an integer number (687560767).

Almost surely, 2^1375121533 is an apocalyptic number.

It is an amenable number.

1375121533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375121533 is an equidigital number, since it uses as much as digits as its factorization.

1375121533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 31.

The square root of 1375121533 is about 37082.6311499063. The cubic root of 1375121533 is about 1112.0228063767.

The spelling of 1375121533 in words is "one billion, three hundred seventy-five million, one hundred twenty-one thousand, five hundred thirty-three".