1531680247 has 2 divisors, whose sum is σ = 1531680248. Its totient is φ = 1531680246.

The previous prime is 1531680187. The next prime is 1531680301. The reversal of 1531680247 is 7420861351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531680247 - 2²³ = 1523291639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531680047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765840123 + 765840124.

It is an arithmetic number, because the mean of its divisors is an integer number (765840124).

Almost surely, 2^1531680247 is an apocalyptic number.

1531680247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531680247 is an equidigital number, since it uses as much as digits as its factorization.

1531680247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1531680247 is about 39136.6867146415. The cubic root of 1531680247 is about 1152.7170153617.

The spelling of 1531680247 in words is "one billion, five hundred thirty-one million, six hundred eighty thousand, two hundred forty-seven".