1257551479 has 2 divisors, whose sum is σ = 1257551480. Its totient is φ = 1257551478.

The previous prime is 1257551453. The next prime is 1257551483. The reversal of 1257551479 is 9741557521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257551479 - 2²¹ = 1255454327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257551279) 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, 628775739 + 628775740.

It is an arithmetic number, because the mean of its divisors is an integer number (628775740).

Almost surely, 2^1257551479 is an apocalyptic number.

1257551479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257551479 is an equidigital number, since it uses as much as digits as its factorization.

1257551479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441000, while the sum is 46.

The square root of 1257551479 is about 35461.9722942760. The cubic root of 1257551479 is about 1079.3822138369.

The spelling of 1257551479 in words is "one billion, two hundred fifty-seven million, five hundred fifty-one thousand, four hundred seventy-nine".