1531969997 has 8 divisors (see below), whose sum is σ = 1583831040. Its totient is φ = 1480261680.

The previous prime is 1531969973. The next prime is 1531970009. The reversal of 1531969997 is 7999691351.

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

It is a cyclic number.

It is not a de Polignac number, because 1531969997 - 2¹⁰ = 1531968973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531965997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17597 + ... + 58082.

It is an arithmetic number, because the mean of its divisors is an integer number (197978880).

Almost surely, 2^1531969997 is an apocalyptic number.

It is an amenable number.

1531969997 is a deficient number, since it is larger than the sum of its proper divisors (51861043).

1531969997 is an equidigital number, since it uses as much as digits as its factorization.

1531969997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76363.

The product of its digits is 4133430, while the sum is 59.

The square root of 1531969997 is about 39140.3883092644. The cubic root of 1531969997 is about 1152.7896977850.

The spelling of 1531969997 in words is "one billion, five hundred thirty-one million, nine hundred sixty-nine thousand, nine hundred ninety-seven".