1075531721 has 8 divisors (see below), whose sum is σ = 1201925088. Its totient is φ = 953908000.

The previous prime is 1075531697. The next prime is 1075531733. The reversal of 1075531721 is 1271355701.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1075531721 - 2¹⁸ = 1075269577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1075531421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191935 + ... + 1192836.

It is an arithmetic number, because the mean of its divisors is an integer number (150240636).

Almost surely, 2^1075531721 is an apocalyptic number.

1075531721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1075531721 is a deficient number, since it is larger than the sum of its proper divisors (126393367).

1075531721 is a wasteful number, since it uses less digits than its factorization.

1075531721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384823.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 1075531721 is about 32795.3002883035. The cubic root of 1075531721 is about 1024.5686770601.

The spelling of 1075531721 in words is "one billion, seventy-five million, five hundred thirty-one thousand, seven hundred twenty-one".