1523721673 has 2 divisors, whose sum is σ = 1523721674. Its totient is φ = 1523721672.

The previous prime is 1523721659. The next prime is 1523721677. The reversal of 1523721673 is 3761273251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1453363129 + 70358544 = 38123^2 + 8388^2 .

It is a cyclic number.

It is not a de Polignac number, because 1523721673 - 2¹³ = 1523713481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1523721677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761860836 + 761860837.

It is an arithmetic number, because the mean of its divisors is an integer number (761860837).

Almost surely, 2^1523721673 is an apocalyptic number.

It is an amenable number.

1523721673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1523721673 is an equidigital number, since it uses as much as digits as its factorization.

1523721673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The square root of 1523721673 is about 39034.8776480726. The cubic root of 1523721673 is about 1150.7170507305.

The spelling of 1523721673 in words is "one billion, five hundred twenty-three million, seven hundred twenty-one thousand, six hundred seventy-three".