7072561 has 8 divisors (see below), whose sum is σ = 7567560. Its totient is φ = 6586368.

The previous prime is 7072553. The next prime is 7072567. The reversal of 7072561 is 1652707.

7072561 = 1880² + 1881².

It can be written as a sum of positive squares in 4 ways, for example, as 3534400 + 3538161 = 1880^2 + 1881^2 .

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 7072561 - 2³ = 7072553 is a prime.

It is a super-2 number, since 2×7072561² = 100042238197442, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7072567) 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, 496 + ... + 3793.

It is an arithmetic number, because the mean of its divisors is an integer number (945945).

Almost surely, 2^7072561 is an apocalyptic number.

7072561 is the 1881-st centered square number.

It is an amenable number.

7072561 is a deficient number, since it is larger than the sum of its proper divisors (494999).

7072561 is a wasteful number, since it uses less digits than its factorization.

7072561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 7072561 is about 2659.4286980478. The cubic root of 7072561 is about 191.9518198697.

The spelling of 7072561 in words is "seven million, seventy-two thousand, five hundred sixty-one".