1554638461 has 2 divisors, whose sum is σ = 1554638462. Its totient is φ = 1554638460.

The previous prime is 1554638429. The next prime is 1554638473. The reversal of 1554638461 is 1648364551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989102500 + 565535961 = 31450^2 + 23781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554638461 - 2⁵ = 1554638429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1554638161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777319230 + 777319231.

It is an arithmetic number, because the mean of its divisors is an integer number (777319231).

Almost surely, 2^1554638461 is an apocalyptic number.

It is an amenable number.

1554638461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1554638461 is an equidigital number, since it uses as much as digits as its factorization.

1554638461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 43.

The square root of 1554638461 is about 39428.9038777392. The cubic root of 1554638461 is about 1158.4478003103.

The spelling of 1554638461 in words is "one billion, five hundred fifty-four million, six hundred thirty-eight thousand, four hundred sixty-one".