147772421 has 2 divisors, whose sum is σ = 147772422. Its totient is φ = 147772420.

The previous prime is 147772411. The next prime is 147772433. The reversal of 147772421 is 124277741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145564225 + 2208196 = 12065^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 147772421 - 2¹⁸ = 147510277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147772411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73886210 + 73886211.

It is an arithmetic number, because the mean of its divisors is an integer number (73886211).

Almost surely, 2^147772421 is an apocalyptic number.

It is an amenable number.

147772421 is a deficient number, since it is larger than the sum of its proper divisors (1).

147772421 is an equidigital number, since it uses as much as digits as its factorization.

147772421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 35.

The square root of 147772421 is about 12156.1680228598. The cubic root of 147772421 is about 528.6859830430.

The spelling of 147772421 in words is "one hundred forty-seven million, seven hundred seventy-two thousand, four hundred twenty-one".