249041531 has 16 divisors (see below), whose sum is σ = 272160000. Its totient is φ = 226983456.

The previous prime is 249041521. The next prime is 249041543. The reversal of 249041531 is 135140942.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249041531 is a prime.

It is a super-2 number, since 2×249041531² = 124043368325647922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249041494 and 249041503.

It is not an unprimeable number, because it can be changed into a prime (249041501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197180 + ... + 198438.

It is an arithmetic number, because the mean of its divisors is an integer number (17010000).

Almost surely, 2^249041531 is an apocalyptic number.

249041531 is the 7058-th centered decagonal number.

249041531 is a deficient number, since it is larger than the sum of its proper divisors (23118469).

249041531 is a wasteful number, since it uses less digits than its factorization.

249041531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 249041531 is about 15781.0497432839. The cubic root of 249041531 is about 629.1544304001.

The spelling of 249041531 in words is "two hundred forty-nine million, forty-one thousand, five hundred thirty-one".