254487661 has 2 divisors, whose sum is σ = 254487662. Its totient is φ = 254487660.

The previous prime is 254487619. The next prime is 254487689. The reversal of 254487661 is 166784452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235039561 + 19448100 = 15331^2 + 4410^2 .

It is a cyclic number.

It is not a de Polignac number, because 254487661 - 2¹¹ = 254485613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254487461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127243830 + 127243831.

It is an arithmetic number, because the mean of its divisors is an integer number (127243831).

Almost surely, 2^254487661 is an apocalyptic number.

It is an amenable number.

254487661 is a deficient number, since it is larger than the sum of its proper divisors (1).

254487661 is an equidigital number, since it uses as much as digits as its factorization.

254487661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 254487661 is about 15952.6694004483. The cubic root of 254487661 is about 633.7075918751.

The spelling of 254487661 in words is "two hundred fifty-four million, four hundred eighty-seven thousand, six hundred sixty-one".