10721537 has 4 divisors (see below), whose sum is σ = 10748676. Its totient is φ = 10694400.

The previous prime is 10721489. The next prime is 10721549. The reversal of 10721537 is 73512701.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9431041 + 1290496 = 3071^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 10721537 - 2¹⁴ = 10705153 is a prime.

It is a super-2 number, since 2×10721537² = 229902711284738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10721587) 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, 12968 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (2687169).

Almost surely, 2^10721537 is an apocalyptic number.

It is an amenable number.

10721537 is a deficient number, since it is larger than the sum of its proper divisors (27139).

10721537 is an equidigital number, since it uses as much as digits as its factorization.

10721537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27138.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 10721537 is about 3274.3758183813. The cubic root of 10721537 is about 220.5052917353.

The spelling of 10721537 in words is "ten million, seven hundred twenty-one thousand, five hundred thirty-seven".