1261241435 has 4 divisors (see below), whose sum is σ = 1513489728. Its totient is φ = 1008993144.

The previous prime is 1261241411. The next prime is 1261241437. The reversal of 1261241435 is 5341421621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5341421621 = 991 ⋅5389931.

It is a cyclic number.

It is not a de Polignac number, because 1261241435 - 2²⁴ = 1244464219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261241398 and 1261241407.

It is not an unprimeable number, because it can be changed into a prime (1261241437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126124139 + ... + 126124148.

It is an arithmetic number, because the mean of its divisors is an integer number (378372432).

Almost surely, 2^1261241435 is an apocalyptic number.

1261241435 is a deficient number, since it is larger than the sum of its proper divisors (252248293).

1261241435 is an equidigital number, since it uses as much as digits as its factorization.

1261241435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252248292.

The product of its digits is 5760, while the sum is 29.

The square root of 1261241435 is about 35513.9611279846. The cubic root of 1261241435 is about 1080.4369045631.

The spelling of 1261241435 in words is "one billion, two hundred sixty-one million, two hundred forty-one thousand, four hundred thirty-five".