1231451151511 has 16 divisors (see below), whose sum is σ = 1455328871424. Its totient is φ = 1020156961824.

The previous prime is 1231451151487. The next prime is 1231451151517. The reversal of 1231451151511 is 1151511541321.

It is not a de Polignac number, because 1231451151511 - 2¹⁹ = 1231450627223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231451151517) 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, 24745855 + ... + 24795568.

It is an arithmetic number, because the mean of its divisors is an integer number (90958054464).

Almost surely, 2^{1231451151511} is an apocalyptic number.

1231451151511 is a deficient number, since it is larger than the sum of its proper divisors (223877719913).

1231451151511 is an equidigital number, since it uses as much as digits as its factorization.

1231451151511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49541550.

The product of its digits is 3000, while the sum is 31.

Adding to 1231451151511 its reverse (1151511541321), we get a palindrome (2382962692832).

The spelling of 1231451151511 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-one million, one hundred fifty-one thousand, five hundred eleven".