637420541 has 2 divisors, whose sum is σ = 637420542. Its totient is φ = 637420540.

The previous prime is 637420477. The next prime is 637420561. The reversal of 637420541 is 145024736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637360516 + 60025 = 25246^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 637420541 - 2⁶ = 637420477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 637420498 and 637420507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (637420561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318710270 + 318710271.

It is an arithmetic number, because the mean of its divisors is an integer number (318710271).

Almost surely, 2^637420541 is an apocalyptic number.

It is an amenable number.

637420541 is a deficient number, since it is larger than the sum of its proper divisors (1).

637420541 is an equidigital number, since it uses as much as digits as its factorization.

637420541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 637420541 is about 25247.1887741982. The cubic root of 637420541 is about 860.6145512759.

The spelling of 637420541 in words is "six hundred thirty-seven million, four hundred twenty thousand, five hundred forty-one".