420971613 has 4 divisors (see below), whose sum is σ = 561295488. Its totient is φ = 280647740.

The previous prime is 420971563. The next prime is 420971623. The reversal of 420971613 is 316179024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420971613 - 2⁹ = 420971101 is a prime.

It is a super-3 number, since 3×420971613³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420971623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70161933 + ... + 70161938.

It is an arithmetic number, because the mean of its divisors is an integer number (140323872).

Almost surely, 2^420971613 is an apocalyptic number.

It is an amenable number.

420971613 is a deficient number, since it is larger than the sum of its proper divisors (140323875).

420971613 is a wasteful number, since it uses less digits than its factorization.

420971613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140323874.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 420971613 is about 20517.5927681587. The cubic root of 420971613 is about 749.4642769811.

The spelling of 420971613 in words is "four hundred twenty million, nine hundred seventy-one thousand, six hundred thirteen".