431429987 has 2 divisors, whose sum is σ = 431429988. Its totient is φ = 431429986.

The previous prime is 431429939. The next prime is 431430019. The reversal of 431429987 is 789924134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 431429987 - 2¹⁸ = 431167843 is a prime.

It is a super-2 number, since 2×431429987² = 372263667365640338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431429087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215714993 + 215714994.

It is an arithmetic number, because the mean of its divisors is an integer number (215714994).

Almost surely, 2^431429987 is an apocalyptic number.

431429987 is a deficient number, since it is larger than the sum of its proper divisors (1).

431429987 is an equidigital number, since it uses as much as digits as its factorization.

431429987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 431429987 is about 20770.8927829306. The cubic root of 431429987 is about 755.6199968449.

The spelling of 431429987 in words is "four hundred thirty-one million, four hundred twenty-nine thousand, nine hundred eighty-seven".