10621531 has 4 divisors (see below), whose sum is σ = 10629864. Its totient is φ = 10613200.

The previous prime is 10621517. The next prime is 10621537. The reversal of 10621531 is 13512601.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10621531 is a prime.

It is a super-2 number, since 2×10621531² = 225633841567922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10621499 and 10621508.

It is not an unprimeable number, because it can be changed into a prime (10621537) 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, 1810 + ... + 4951.

It is an arithmetic number, because the mean of its divisors is an integer number (2657466).

Almost surely, 2^10621531 is an apocalyptic number.

10621531 is the 1458-th centered decagonal number.

10621531 is a deficient number, since it is larger than the sum of its proper divisors (8333).

10621531 is an equidigital number, since it uses as much as digits as its factorization.

10621531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 10621531 is about 3259.0690388514. The cubic root of 10621531 is about 219.8175553532.

The spelling of 10621531 in words is "ten million, six hundred twenty-one thousand, five hundred thirty-one".