31420081 has 16 divisors (see below), whose sum is σ = 40439808. Its totient is φ = 23691600.

The previous prime is 31420069. The next prime is 31420099. The reversal of 31420081 is 18002413.

31420081 = 373² + 374² + ... + 526².

It is a cyclic number.

It is not a de Polignac number, because 31420081 - 2⁹ = 31419569 is a prime.

It is a super-2 number, since 2×31420081² = 1974442980093122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31420381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4195 + ... + 8968.

It is an arithmetic number, because the mean of its divisors is an integer number (2527488).

Almost surely, 2^31420081 is an apocalyptic number.

31420081 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31420081 is a deficient number, since it is larger than the sum of its proper divisors (9019727).

31420081 is a wasteful number, since it uses less digits than its factorization.

31420081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13212.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31420081 is about 5605.3618081262. The cubic root of 31420081 is about 315.5506652509.

Adding to 31420081 its reverse (18002413), we get a palindrome (49422494).

The spelling of 31420081 in words is "thirty-one million, four hundred twenty thousand, eighty-one".