420777531 has 8 divisors (see below), whose sum is σ = 623374160. Its totient is φ = 280518336.

The previous prime is 420777503. The next prime is 420777541. The reversal of 420777531 is 135777024.

It is not a de Polignac number, because 420777531 - 2⁵ = 420777499 is a prime.

It is a super-2 number, since 2×420777531² = 354107461188911922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420777541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7792150 + ... + 7792203.

It is an arithmetic number, because the mean of its divisors is an integer number (77921770).

Almost surely, 2^420777531 is an apocalyptic number.

420777531 is a deficient number, since it is larger than the sum of its proper divisors (202596629).

420777531 is a wasteful number, since it uses less digits than its factorization.

420777531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15584362 (or 15584356 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 420777531 is about 20512.8625744921. The cubic root of 420777531 is about 749.3490832399.

The spelling of 420777531 in words is "four hundred twenty million, seven hundred seventy-seven thousand, five hundred thirty-one".