1256215141 has 8 divisors (see below), whose sum is σ = 1283083200. Its totient is φ = 1229602080.

The previous prime is 1256215123. The next prime is 1256215159. The reversal of 1256215141 is 1415126521.

It is an interprime number because it is at equal distance from previous prime (1256215123) and next prime (1256215159).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256215141 - 2¹⁹ = 1255690853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256215111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53776 + ... + 73513.

It is an arithmetic number, because the mean of its divisors is an integer number (160385400).

Almost surely, 2^1256215141 is an apocalyptic number.

It is an amenable number.

1256215141 is a deficient number, since it is larger than the sum of its proper divisors (26868059).

1256215141 is a wasteful number, since it uses less digits than its factorization.

1256215141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127499.

The product of its digits is 2400, while the sum is 28.

The square root of 1256215141 is about 35443.1254406267. The cubic root of 1256215141 is about 1078.9997428940. Note that the first 3 decimals are identical.

The spelling of 1256215141 in words is "one billion, two hundred fifty-six million, two hundred fifteen thousand, one hundred forty-one".