125561287 has 2 divisors, whose sum is σ = 125561288. Its totient is φ = 125561286.

The previous prime is 125561243. The next prime is 125561309. The reversal of 125561287 is 782165521.

It is a strong prime.

It is an emirp because it is prime and its reverse (782165521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125561287 - 2¹⁵ = 125528519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125561087) 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, 62780643 + 62780644.

It is an arithmetic number, because the mean of its divisors is an integer number (62780644).

Almost surely, 2^125561287 is an apocalyptic number.

125561287 is a deficient number, since it is larger than the sum of its proper divisors (1).

125561287 is an equidigital number, since it uses as much as digits as its factorization.

125561287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 37.

The square root of 125561287 is about 11205.4132900130. The cubic root of 125561287 is about 500.7472652994.

The spelling of 125561287 in words is "one hundred twenty-five million, five hundred sixty-one thousand, two hundred eighty-seven".