420878651 has 2 divisors, whose sum is σ = 420878652. Its totient is φ = 420878650.

The previous prime is 420878617. The next prime is 420878687. The reversal of 420878651 is 156878024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420878651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420878599 and 420878608.

It is not a weakly prime, because it can be changed into another prime (420878611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210439325 + 210439326.

It is an arithmetic number, because the mean of its divisors is an integer number (210439326).

Almost surely, 2^420878651 is an apocalyptic number.

420878651 is a deficient number, since it is larger than the sum of its proper divisors (1).

420878651 is an equidigital number, since it uses as much as digits as its factorization.

420878651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 420878651 is about 20515.3272213728. The cubic root of 420878651 is about 749.4091055435.

The spelling of 420878651 in words is "four hundred twenty million, eight hundred seventy-eight thousand, six hundred fifty-one".