1261230436 has 6 divisors (see below), whose sum is σ = 2207153270. Its totient is φ = 630615216.

The previous prime is 1261230427. The next prime is 1261230473. The reversal of 1261230436 is 6340321621.

It can be written as a sum of positive squares in only one way, i.e., 1028484900 + 232745536 = 32070^2 + 15256^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157653801 + ... + 157653808.

Almost surely, 2^1261230436 is an apocalyptic number.

It is an amenable number.

1261230436 is a deficient number, since it is larger than the sum of its proper divisors (945922834).

1261230436 is a wasteful number, since it uses less digits than its factorization.

1261230436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315307613 (or 315307611 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1261230436 is about 35513.8062730539. The cubic root of 1261230436 is about 1080.4337638057.

It can be divided in two parts, 1261230 and 436, that added together give a triangular number (1261666 = T₁₅₈₈).

The spelling of 1261230436 in words is "one billion, two hundred sixty-one million, two hundred thirty thousand, four hundred thirty-six".