1430991997 has 4 divisors (see below), whose sum is σ = 1457991900. Its totient is φ = 1403992096.

The previous prime is 1430991967. The next prime is 1430992001. The reversal of 1430991997 is 7991990341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1226330361 + 204661636 = 35019^2 + 14306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1430991997 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 (1430991967) 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, 13499872 + ... + 13499977.

It is an arithmetic number, because the mean of its divisors is an integer number (364497975).

Almost surely, 2^1430991997 is an apocalyptic number.

It is an amenable number.

1430991997 is a deficient number, since it is larger than the sum of its proper divisors (26999903).

1430991997 is an equidigital number, since it uses as much as digits as its factorization.

1430991997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26999902.

The product of its (nonzero) digits is 551124, while the sum is 52.

The square root of 1430991997 is about 37828.4548587436. The cubic root of 1430991997 is about 1126.8836255248.

The spelling of 1430991997 in words is "one billion, four hundred thirty million, nine hundred ninety-one thousand, nine hundred ninety-seven".