1261042519 has 12 divisors (see below), whose sum is σ = 1387060192. Its totient is φ = 1145612160.

The previous prime is 1261042511. The next prime is 1261042537. The reversal of 1261042519 is 9152401621.

It is not a de Polignac number, because 1261042519 - 2³ = 1261042511 is a prime.

It is a super-2 number, since 2×1261042519² = 3180456469451730722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261042511) 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 in 11 ways as a sum of consecutive naturals, for example, 241474 + ... + 246640.

Almost surely, 2^1261042519 is an apocalyptic number.

1261042519 is a deficient number, since it is larger than the sum of its proper divisors (126017673).

1261042519 is a wasteful number, since it uses less digits than its factorization.

1261042519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7206 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1261042519 is about 35511.1604851207. The cubic root of 1261042519 is about 1080.3801014058.

The spelling of 1261042519 in words is "one billion, two hundred sixty-one million, forty-two thousand, five hundred nineteen".