1874172721 has 2 divisors, whose sum is σ = 1874172722. Its totient is φ = 1874172720.

The previous prime is 1874172691. The next prime is 1874172739. The reversal of 1874172721 is 1272714781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1349533696 + 524639025 = 36736^2 + 22905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1874172721 - 2¹¹ = 1874170673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1874172761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 937086360 + 937086361.

It is an arithmetic number, because the mean of its divisors is an integer number (937086361).

Almost surely, 2^1874172721 is an apocalyptic number.

It is an amenable number.

1874172721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1874172721 is an equidigital number, since it uses as much as digits as its factorization.

1874172721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43904, while the sum is 40.

The square root of 1874172721 is about 43291.7165402343. The cubic root of 1874172721 is about 1232.9246553346.

The spelling of 1874172721 in words is "one billion, eight hundred seventy-four million, one hundred seventy-two thousand, seven hundred twenty-one".