1531963397 has 2 divisors, whose sum is σ = 1531963398. Its totient is φ = 1531963396.

The previous prime is 1531963351. The next prime is 1531963427. The reversal of 1531963397 is 7933691351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175735521 + 356227876 = 34289^2 + 18874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531963397 - 2¹⁴ = 1531947013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531963337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765981698 + 765981699.

It is an arithmetic number, because the mean of its divisors is an integer number (765981699).

Almost surely, 2^1531963397 is an apocalyptic number.

It is an amenable number.

1531963397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531963397 is an equidigital number, since it uses as much as digits as its factorization.

1531963397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 459270, while the sum is 47.

The square root of 1531963397 is about 39140.3039972865. The cubic root of 1531963397 is about 1152.7880423081.

The spelling of 1531963397 in words is "one billion, five hundred thirty-one million, nine hundred sixty-three thousand, three hundred ninety-seven".