31146661 has 32 divisors (see below), whose sum is σ = 40441856. Its totient is φ = 23328000.

The previous prime is 31146659. The next prime is 31146673. The reversal of 31146661 is 16664113.

It is a 4-Lehmer number, since φ(31146661) divides (31146661-1)⁴.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 31146661 - 2¹ = 31146659 is a prime.

It is a super-2 number, since 2×31146661² = 1940228982897842, which contains 22 as substring.

It is a deceptive number, since it divides R_31146660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31146161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171991 + ... + 172171.

It is an arithmetic number, because the mean of its divisors is an integer number (1263808).

It is a Poulet number, since it divides 2^31146660-1.

Almost surely, 2^31146661 is an apocalyptic number.

31146661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31146661 is a deficient number, since it is larger than the sum of its proper divisors (9295195).

31146661 is a wasteful number, since it uses less digits than its factorization.

31146661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its digits is 2592, while the sum is 28.

The square root of 31146661 is about 5580.9193687062. The cubic root of 31146661 is about 314.6326817759.

The spelling of 31146661 in words is "thirty-one million, one hundred forty-six thousand, six hundred sixty-one".