2801531 has 4 divisors (see below), whose sum is σ = 2949000. Its totient is φ = 2654064.

The previous prime is 2801509. The next prime is 2801543. The reversal of 2801531 is 1351082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1351082 = 2 ⋅675541.

It is a cyclic number.

It is not a de Polignac number, because 2801531 - 2¹⁰ = 2800507 is a prime.

It is a super-2 number, since 2×2801531² = 15697151887922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2801431) 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, 73706 + ... + 73743.

It is an arithmetic number, because the mean of its divisors is an integer number (737250).

2^2801531 is an apocalyptic number.

2801531 is a deficient number, since it is larger than the sum of its proper divisors (147469).

2801531 is a wasteful number, since it uses less digits than its factorization.

2801531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147468.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2801531 is about 1673.7774643004. Note that the first 3 decimals coincide. The cubic root of 2801531 is about 140.9716590424.

The spelling of 2801531 in words is "two million, eight hundred one thousand, five hundred thirty-one".