1351405642 has 4 divisors (see below), whose sum is σ = 2027108466. Its totient is φ = 675702820.

The previous prime is 1351405639. The next prime is 1351405709. The reversal of 1351405642 is 2465041531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2465041531 = 17 ⋅145002443.

It can be written as a sum of positive squares in only one way, i.e., 971506561 + 379899081 = 31169^2 + 19491^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337851409 + ... + 337851412.

Almost surely, 2^1351405642 is an apocalyptic number.

1351405642 is a deficient number, since it is larger than the sum of its proper divisors (675702824).

1351405642 is an equidigital number, since it uses as much as digits as its factorization.

1351405642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675702823.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1351405642 is about 36761.4695299304. The cubic root of 1351405642 is about 1105.5929038998.

The spelling of 1351405642 in words is "one billion, three hundred fifty-one million, four hundred five thousand, six hundred forty-two".