637421461 has 2 divisors, whose sum is σ = 637421462. Its totient is φ = 637421460.

The previous prime is 637421419. The next prime is 637421467. The reversal of 637421461 is 164124736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538518436 + 98903025 = 23206^2 + 9945^2 .

It is a cyclic number.

It is not a de Polignac number, because 637421461 - 2¹¹ = 637419413 is a prime.

It is a super-2 number, since 2×637421461² = 812612237886749042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637421467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318710730 + 318710731.

It is an arithmetic number, because the mean of its divisors is an integer number (318710731).

Almost surely, 2^637421461 is an apocalyptic number.

It is an amenable number.

637421461 is a deficient number, since it is larger than the sum of its proper divisors (1).

637421461 is an equidigital number, since it uses as much as digits as its factorization.

637421461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 637421461 is about 25247.2069940419. The cubic root of 637421461 is about 860.6149653222.

The spelling of 637421461 in words is "six hundred thirty-seven million, four hundred twenty-one thousand, four hundred sixty-one".