31221485 has 16 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 24557376.

The previous prime is 31221473. The next prime is 31221493. The reversal of 31221485 is 58412213.

31221485 = T₃₄₁ + T₃₄₂ + ... + T₆₀₉.

It is a cyclic number.

It is not a de Polignac number, because 31221485 - 2¹⁴ = 31205101 is a prime.

It is a super-2 number, since 2×31221485² = 1949562251210450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115931 + ... + 116199.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^31221485 is an apocalyptic number.

It is an amenable number.

31221485 is a deficient number, since it is larger than the sum of its proper divisors (6880915).

31221485 is a wasteful number, since it uses less digits than its factorization.

31221485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its digits is 1920, while the sum is 26.

The square root of 31221485 is about 5587.6189025380. The cubic root of 31221485 is about 314.8844289224.

Adding to 31221485 its reverse (58412213), we get a palindrome (89633698).

The spelling of 31221485 in words is "thirty-one million, two hundred twenty-one thousand, four hundred eighty-five".