2061531 has 20 divisors (see below), whose sum is σ = 3182784. Its totient is φ = 1328400.

The previous prime is 2061503. The next prime is 2061533. The reversal of 2061531 is 1351602.

2061531 is a `hidden beast` number, since 20 + 615 + 31 = 666.

It is not a de Polignac number, because 2061531 - 2¹⁰ = 2060507 is a prime.

It is a super-4 number, since 4×2061531⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2061533) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2101 + ... + 2921.

2^2061531 is an apocalyptic number.

2061531 is a deficient number, since it is larger than the sum of its proper divisors (1121253).

2061531 is an equidigital number, since it uses as much as digits as its factorization.

2061531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2061531 is about 1435.8032595032. The cubic root of 2061531 is about 127.2711465635.

The spelling of 2061531 in words is "two million, sixty-one thousand, five hundred thirty-one".