1240561319 has 4 divisors (see below), whose sum is σ = 1305854040. Its totient is φ = 1175268600.

The previous prime is 1240561303. The next prime is 1240561339. The reversal of 1240561319 is 9131650421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9131650421 = 41 ⋅222723181.

It is a cyclic number.

It is not a de Polignac number, because 1240561319 - 2⁴ = 1240561303 is a prime.

It is a super-2 number, since 2×1240561319² = 3077984772398039522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240561339) 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, 32646332 + ... + 32646369.

It is an arithmetic number, because the mean of its divisors is an integer number (326463510).

Almost surely, 2^1240561319 is an apocalyptic number.

1240561319 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1240561319 is a deficient number, since it is larger than the sum of its proper divisors (65292721).

1240561319 is an equidigital number, since it uses as much as digits as its factorization.

1240561319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65292720.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1240561319 is about 35221.6030157629. The cubic root of 1240561319 is about 1074.4991556229.

The spelling of 1240561319 in words is "one billion, two hundred forty million, five hundred sixty-one thousand, three hundred nineteen".