420905131 has 2 divisors, whose sum is σ = 420905132. Its totient is φ = 420905130.

The previous prime is 420905053. The next prime is 420905137. The reversal of 420905131 is 131509024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420905131 - 2¹⁷ = 420774059 is a prime.

It is a super-2 number, since 2×420905131² = 354322258604254322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420905096 and 420905105.

It is not a weakly prime, because it can be changed into another prime (420905137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210452565 + 210452566.

It is an arithmetic number, because the mean of its divisors is an integer number (210452566).

Almost surely, 2^420905131 is an apocalyptic number.

420905131 is a deficient number, since it is larger than the sum of its proper divisors (1).

420905131 is an equidigital number, since it uses as much as digits as its factorization.

420905131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 420905131 is about 20515.9725823564. The cubic root of 420905131 is about 749.4248218210.

The spelling of 420905131 in words is "four hundred twenty million, nine hundred five thousand, one hundred thirty-one".