1261402743 has 4 divisors (see below), whose sum is σ = 1681870328. Its totient is φ = 840935160.

The previous prime is 1261402733. The next prime is 1261402757. The reversal of 1261402743 is 3472041621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1261402743 - 2³⁰ = 187660919 is a prime.

It is a super-2 number, since 2×1261402743² = 3182273760095848098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261402743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261402733) 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, 210233788 + ... + 210233793.

It is an arithmetic number, because the mean of its divisors is an integer number (420467582).

Almost surely, 2^1261402743 is an apocalyptic number.

1261402743 is a deficient number, since it is larger than the sum of its proper divisors (420467585).

1261402743 is an equidigital number, since it uses as much as digits as its factorization.

1261402743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420467584.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1261402743 is about 35516.2321058977. The cubic root of 1261402743 is about 1080.4829638615.

The spelling of 1261402743 in words is "one billion, two hundred sixty-one million, four hundred two thousand, seven hundred forty-three".