1372737521 has 2 divisors, whose sum is σ = 1372737522. Its totient is φ = 1372737520.

The previous prime is 1372737511. The next prime is 1372737529. The reversal of 1372737521 is 1257372731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1082410000 + 290327521 = 32900^2 + 17039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1372737521 is a prime.

It is a super-2 number, since 2×1372737521² = 3768816603122450882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1372737529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686368760 + 686368761.

It is an arithmetic number, because the mean of its divisors is an integer number (686368761).

Almost surely, 2^1372737521 is an apocalyptic number.

It is an amenable number.

1372737521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372737521 is an equidigital number, since it uses as much as digits as its factorization.

1372737521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 38.

The square root of 1372737521 is about 37050.4726150693. The cubic root of 1372737521 is about 1111.3798064280.

The spelling of 1372737521 in words is "one billion, three hundred seventy-two million, seven hundred thirty-seven thousand, five hundred twenty-one".