531290391 has 8 divisors (see below), whose sum is σ = 721753200. Its totient is φ = 347510592.

The previous prime is 531290381. The next prime is 531290429. The reversal of 531290391 is 193092135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 531290391 - 2⁵ = 531290359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531290381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670566 + ... + 1670883.

It is an arithmetic number, because the mean of its divisors is an integer number (90219150).

Almost surely, 2^531290391 is an apocalyptic number.

531290391 is a deficient number, since it is larger than the sum of its proper divisors (190462809).

531290391 is a wasteful number, since it uses less digits than its factorization.

531290391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341505.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 531290391 is about 23049.7373303906. The cubic root of 531290391 is about 809.9234754714.

It can be divided in two parts, 5312 and 90391, that added together give a triangular number (95703 = T₄₃₇).

The spelling of 531290391 in words is "five hundred thirty-one million, two hundred ninety thousand, three hundred ninety-one".