1431951421 has 4 divisors (see below), whose sum is σ = 1445088700. Its totient is φ = 1418814144.

The previous prime is 1431951413. The next prime is 1431951439. The reversal of 1431951421 is 1241591341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241591341 = 499 ⋅2488159.

It can be written as a sum of positive squares in 2 ways, for example, as 817159396 + 614792025 = 28586^2 + 24795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431951421 - 2³ = 1431951413 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 (1431951221) 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, 6568476 + ... + 6568693.

It is an arithmetic number, because the mean of its divisors is an integer number (361272175).

Almost surely, 2^1431951421 is an apocalyptic number.

It is an amenable number.

1431951421 is a deficient number, since it is larger than the sum of its proper divisors (13137279).

1431951421 is a wasteful number, since it uses less digits than its factorization.

1431951421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13137278.

The product of its digits is 4320, while the sum is 31.

The square root of 1431951421 is about 37841.1339814229. The cubic root of 1431951421 is about 1127.1354130174.

The spelling of 1431951421 in words is "one billion, four hundred thirty-one million, nine hundred fifty-one thousand, four hundred twenty-one".