531542978 has 8 divisors (see below), whose sum is σ = 844215372. Its totient is φ = 250137856.

The previous prime is 531542941. The next prime is 531542987. The reversal of 531542978 is 879245135.

It can be written as a sum of positive squares in 2 ways, for example, as 496532089 + 35010889 = 22283^2 + 5917^2 .

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

It is a super-2 number, since 2×531542978² = 565075874922216968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816775 + ... + 7816842.

Almost surely, 2^531542978 is an apocalyptic number.

531542978 is a deficient number, since it is larger than the sum of its proper divisors (312672394).

531542978 is a wasteful number, since it uses less digits than its factorization.

531542978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15633636.

The product of its digits is 302400, while the sum is 44.

The square root of 531542978 is about 23055.2158523836. The cubic root of 531542978 is about 810.0518068779.

The spelling of 531542978 in words is "five hundred thirty-one million, five hundred forty-two thousand, nine hundred seventy-eight".