431987423437 has 2 divisors, whose sum is σ = 431987423438. Its totient is φ = 431987423436.

The previous prime is 431987423393. The next prime is 431987423473. The reversal of 431987423437 is 734324789134.

Together with next prime (431987423473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394919237476 + 37068185961 = 628426^2 + 192531^2 .

It is a cyclic number.

It is not a de Polignac number, because 431987423437 - 2²³ = 431979034829 is a prime.

It is a super-2 number, since 2×431987423437² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431987423737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215993711718 + 215993711719.

It is an arithmetic number, because the mean of its divisors is an integer number (215993711719).

Almost surely, 2^431987423437 is an apocalyptic number.

It is an amenable number.

431987423437 is a deficient number, since it is larger than the sum of its proper divisors (1).

431987423437 is an equidigital number, since it uses as much as digits as its factorization.

431987423437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 55.

The spelling of 431987423437 in words is "four hundred thirty-one billion, nine hundred eighty-seven million, four hundred twenty-three thousand, four hundred thirty-seven".