1231640430445 has 16 divisors (see below), whose sum is σ = 1566425806848. Its totient is φ = 926453259520.

The previous prime is 1231640430409. The next prime is 1231640430467. The reversal of 1231640430445 is 5440340461321.

It is not a de Polignac number, because 1231640430445 - 2¹³ = 1231640422253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6939469 + ... + 7114738.

It is an arithmetic number, because the mean of its divisors is an integer number (97901612928).

Almost surely, 2^{1231640430445} is an apocalyptic number.

It is an amenable number.

1231640430445 is a deficient number, since it is larger than the sum of its proper divisors (334785376403).

1231640430445 is a wasteful number, since it uses less digits than its factorization.

1231640430445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14055260.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 1231640430445 its reverse (5440340461321), we get a palindrome (6671980891766).

The spelling of 1231640430445 in words is "one trillion, two hundred thirty-one billion, six hundred forty million, four hundred thirty thousand, four hundred forty-five".