421388761 has 2 divisors, whose sum is σ = 421388762. Its totient is φ = 421388760.

The previous prime is 421388749. The next prime is 421388771. The reversal of 421388761 is 167883124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414529600 + 6859161 = 20360^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 421388761 - 2⁷ = 421388633 is a prime.

It is not a weakly prime, because it can be changed into another prime (421388701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210694380 + 210694381.

It is an arithmetic number, because the mean of its divisors is an integer number (210694381).

Almost surely, 2^421388761 is an apocalyptic number.

It is an amenable number.

421388761 is a deficient number, since it is larger than the sum of its proper divisors (1).

421388761 is an equidigital number, since it uses as much as digits as its factorization.

421388761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 421388761 is about 20527.7558685795. The cubic root of 421388761 is about 749.7117475986.

The spelling of 421388761 in words is "four hundred twenty-one million, three hundred eighty-eight thousand, seven hundred sixty-one".