221450531 has 4 divisors (see below), whose sum is σ = 222426312. Its totient is φ = 220474752.

The previous prime is 221450527. The next prime is 221450539. The reversal of 221450531 is 135054122.

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

It is a cyclic number.

It is not a de Polignac number, because 221450531 - 2² = 221450527 is a prime.

It is a super-2 number, since 2×221450531² = 98080675360363922, 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 = 221450497 and 221450506.

It is not an unprimeable number, because it can be changed into a prime (221450539) 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, 487550 + ... + 488003.

It is an arithmetic number, because the mean of its divisors is an integer number (55606578).

Almost surely, 2^221450531 is an apocalyptic number.

221450531 is a deficient number, since it is larger than the sum of its proper divisors (975781).

221450531 is an equidigital number, since it uses as much as digits as its factorization.

221450531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975780.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221450531 is about 14881.2140297759. The cubic root of 221450531 is about 605.0049231209.

The spelling of 221450531 in words is "two hundred twenty-one million, four hundred fifty thousand, five hundred thirty-one".