1073072561 has 4 divisors (see below), whose sum is σ = 1170624624. Its totient is φ = 975520500.

The previous prime is 1073072551. The next prime is 1073072569. The reversal of 1073072561 is 1652703701.

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.

It is a cyclic number.

It is not a de Polignac number, because 1073072561 - 2¹⁴ = 1073056177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1073072569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48776015 + ... + 48776036.

It is an arithmetic number, because the mean of its divisors is an integer number (292656156).

Almost surely, 2^1073072561 is an apocalyptic number.

1073072561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1073072561 is a deficient number, since it is larger than the sum of its proper divisors (97552063).

1073072561 is an equidigital number, since it uses as much as digits as its factorization.

1073072561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97552062.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 1073072561 is about 32757.7862652530. The cubic root of 1073072561 is about 1023.7872028037.

The spelling of 1073072561 in words is "one billion, seventy-three million, seventy-two thousand, five hundred sixty-one".