1431869981 has 2 divisors, whose sum is σ = 1431869982. Its totient is φ = 1431869980.

The previous prime is 1431869977. The next prime is 1431870043. The reversal of 1431869981 is 1899681341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843031225 + 588838756 = 29035^2 + 24266^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431869981 - 2² = 1431869977 is a prime.

It is a super-2 number, since 2×1431869981² = 4100503284977880722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1431869941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 715934990 + 715934991.

It is an arithmetic number, because the mean of its divisors is an integer number (715934991).

Almost surely, 2^1431869981 is an apocalyptic number.

It is an amenable number.

1431869981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1431869981 is an equidigital number, since it uses as much as digits as its factorization.

1431869981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 50.

The square root of 1431869981 is about 37840.0578884335. The cubic root of 1431869981 is about 1127.1140445904.

The spelling of 1431869981 in words is "one billion, four hundred thirty-one million, eight hundred sixty-nine thousand, nine hundred eighty-one".