1215255677 has 2 divisors, whose sum is σ = 1215255678. Its totient is φ = 1215255676.

The previous prime is 1215255631. The next prime is 1215255689. The reversal of 1215255677 is 7765525121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910892761 + 304362916 = 30181^2 + 17446^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215255677 - 2¹² = 1215251581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215255277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607627838 + 607627839.

It is an arithmetic number, because the mean of its divisors is an integer number (607627839).

Almost surely, 2^1215255677 is an apocalyptic number.

It is an amenable number.

1215255677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215255677 is an equidigital number, since it uses as much as digits as its factorization.

1215255677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147000, while the sum is 41.

The square root of 1215255677 is about 34860.5174516960. The cubic root of 1215255677 is about 1067.1428351352.

The spelling of 1215255677 in words is "one billion, two hundred fifteen million, two hundred fifty-five thousand, six hundred seventy-seven".