1161263401 has 4 divisors (see below), whose sum is σ = 1161331972. Its totient is φ = 1161194832.

The previous prime is 1161263393. The next prime is 1161263471. The reversal of 1161263401 is 1043621611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 153264400 + 1007999001 = 12380^2 + 31749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161263401 - 2³ = 1161263393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161263471) 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, 11491 + ... + 49543.

It is an arithmetic number, because the mean of its divisors is an integer number (290332993).

Almost surely, 2^1161263401 is an apocalyptic number.

It is an amenable number.

1161263401 is a deficient number, since it is larger than the sum of its proper divisors (68571).

1161263401 is an equidigital number, since it uses as much as digits as its factorization.

1161263401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68570.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1161263401 is about 34077.3150497512. The cubic root of 1161263401 is about 1051.0988951853.

The spelling of 1161263401 in words is "one billion, one hundred sixty-one million, two hundred sixty-three thousand, four hundred one".