978503531 has 4 divisors (see below), whose sum is σ = 983470752. Its totient is φ = 973536312.

The previous prime is 978503521. The next prime is 978503563. The reversal of 978503531 is 135305879.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135305879 = 4951 ⋅27329.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978503531 is a prime.

It is a super-2 number, since 2×978503531² = 1914938320358935922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978503521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2483315 + ... + 2483708.

It is an arithmetic number, because the mean of its divisors is an integer number (245867688).

Almost surely, 2^978503531 is an apocalyptic number.

978503531 is a deficient number, since it is larger than the sum of its proper divisors (4967221).

978503531 is a wasteful number, since it uses less digits than its factorization.

978503531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4967220.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 978503531 is about 31281.0410792224. The cubic root of 978503531 is about 992.7825439851.

The spelling of 978503531 in words is "nine hundred seventy-eight million, five hundred three thousand, five hundred thirty-one".