1245040311 has 4 divisors (see below), whose sum is σ = 1660053752. Its totient is φ = 830026872.

The previous prime is 1245040283. The next prime is 1245040319. The reversal of 1245040311 is 1130405421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1245040311 - 2¹³ = 1245032119 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 (1245040319) 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, 207506716 + ... + 207506721.

It is an arithmetic number, because the mean of its divisors is an integer number (415013438).

Almost surely, 2^1245040311 is an apocalyptic number.

1245040311 is a deficient number, since it is larger than the sum of its proper divisors (415013441).

1245040311 is an equidigital number, since it uses as much as digits as its factorization.

1245040311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415013440.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1245040311 is about 35285.1287513593. The cubic root of 1245040311 is about 1075.7907464151.

Adding to 1245040311 its reverse (1130405421), we get a palindrome (2375445732).

The spelling of 1245040311 in words is "one billion, two hundred forty-five million, forty thousand, three hundred eleven".