1741561921 has 4 divisors (see below), whose sum is σ = 1899885744. Its totient is φ = 1583238100.

The previous prime is 1741561903. The next prime is 1741561931. The reversal of 1741561921 is 1291651471.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1291651471 = 11 ⋅117422861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1741561921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1741561931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79161895 + ... + 79161916.

It is an arithmetic number, because the mean of its divisors is an integer number (474971436).

Almost surely, 2^1741561921 is an apocalyptic number.

1741561921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1741561921 is a deficient number, since it is larger than the sum of its proper divisors (158323823).

1741561921 is a wasteful number, since it uses less digits than its factorization.

1741561921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158323822.

The product of its digits is 15120, while the sum is 37.

The square root of 1741561921 is about 41732.0251245971. The cubic root of 1741561921 is about 1203.1311563420.

The spelling of 1741561921 in words is "one billion, seven hundred forty-one million, five hundred sixty-one thousand, nine hundred twenty-one".