16531457 has 4 divisors (see below), whose sum is σ = 17250240. Its totient is φ = 15812676.

The previous prime is 16531453. The next prime is 16531469. The reversal of 16531457 is 75413561.

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: 75413561 = 4783 ⋅15767.

It is a cyclic number.

It is not a de Polignac number, because 16531457 - 2² = 16531453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16531453) 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, 359357 + ... + 359402.

It is an arithmetic number, because the mean of its divisors is an integer number (4312560).

It is a Proth number, since it is equal to 1009 ⋅ 2¹⁴ + 1 and 1009 < 2¹⁴.

Almost surely, 2^16531457 is an apocalyptic number.

It is an amenable number.

16531457 is a deficient number, since it is larger than the sum of its proper divisors (718783).

16531457 is an equidigital number, since it uses as much as digits as its factorization.

16531457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718782.

The product of its digits is 12600, while the sum is 32.

The square root of 16531457 is about 4065.8894475871. The cubic root of 16531457 is about 254.7438514601.

The spelling of 16531457 in words is "sixteen million, five hundred thirty-one thousand, four hundred fifty-seven".