1231356601 has 4 divisors (see below), whose sum is σ = 1231482100. Its totient is φ = 1231231104.

The previous prime is 1231356583. The next prime is 1231356613. The reversal of 1231356601 is 1066531321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1066531321 = 23 ⋅46370927.

It can be written as a sum of positive squares in 2 ways, for example, as 568345600 + 663011001 = 23840^2 + 25749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231356601 - 2²⁵ = 1197802169 is a prime.

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 1231356601.

It is not an unprimeable number, because it can be changed into a prime (1231356661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46656 + ... + 68113.

It is an arithmetic number, because the mean of its divisors is an integer number (307870525).

Almost surely, 2^1231356601 is an apocalyptic number.

It is an amenable number.

1231356601 is a deficient number, since it is larger than the sum of its proper divisors (125499).

1231356601 is a wasteful number, since it uses less digits than its factorization.

1231356601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125498.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1231356601 is about 35090.6910875235. The cubic root of 1231356601 is about 1071.8350323601.

Adding to 1231356601 its reverse (1066531321), we get a palindrome (2297887922).

The spelling of 1231356601 in words is "one billion, two hundred thirty-one million, three hundred fifty-six thousand, six hundred one".