1351624661 has 4 divisors (see below), whose sum is σ = 1431132012. Its totient is φ = 1272117312.

The previous prime is 1351624649. The next prime is 1351624669. The reversal of 1351624661 is 1664261531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1664261531 = 23 ⋅72359197.

It can be written as a sum of positive squares in 2 ways, for example, as 1226050225 + 125574436 = 35015^2 + 11206^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351624661 - 2⁶ = 1351624597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351624669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39753650 + ... + 39753683.

It is an arithmetic number, because the mean of its divisors is an integer number (357783003).

Almost surely, 2^1351624661 is an apocalyptic number.

It is an amenable number.

1351624661 is a deficient number, since it is larger than the sum of its proper divisors (79507351).

1351624661 is an equidigital number, since it uses as much as digits as its factorization.

1351624661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79507350.

The product of its digits is 25920, while the sum is 35.

The square root of 1351624661 is about 36764.4483298743. The cubic root of 1351624661 is about 1105.6526275842.

The spelling of 1351624661 in words is "one billion, three hundred fifty-one million, six hundred twenty-four thousand, six hundred sixty-one".