1231401011 has 16 divisors (see below), whose sum is σ = 1282907808. Its totient is φ = 1181030400.

The previous prime is 1231400999. The next prime is 1231401023. The reversal of 1231401011 is 1101041321.

It is an interprime number because it is at equal distance from previous prime (1231400999) and next prime (1231401023).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231401011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231401811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1397291 + ... + 1398171.

It is an arithmetic number, because the mean of its divisors is an integer number (80181738).

Almost surely, 2^1231401011 is an apocalyptic number.

1231401011 is a deficient number, since it is larger than the sum of its proper divisors (51506797).

1231401011 is an equidigital number, since it uses as much as digits as its factorization.

1231401011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1231401011 is about 35091.3238707234. The cubic root of 1231401011 is about 1071.8479177749.

Adding to 1231401011 its reverse (1101041321), we get a palindrome (2332442332).

The spelling of 1231401011 in words is "one billion, two hundred thirty-one million, four hundred one thousand, eleven".