1357171621 has 8 divisors (see below), whose sum is σ = 1463294840. Its totient is φ = 1251294912.

The previous prime is 1357171601. The next prime is 1357171639. The reversal of 1357171621 is 1261717531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31192225 + 1325979396 = 5585^2 + 36414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1357171621 - 2¹³ = 1357163429 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 (1357171601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50106 + ... + 72283.

It is an arithmetic number, because the mean of its divisors is an integer number (182911855).

Almost surely, 2^1357171621 is an apocalyptic number.

It is an amenable number.

1357171621 is a deficient number, since it is larger than the sum of its proper divisors (106123219).

1357171621 is a wasteful number, since it uses less digits than its factorization.

1357171621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123255.

The product of its digits is 8820, while the sum is 34.

The square root of 1357171621 is about 36839.8102736700. The cubic root of 1357171621 is about 1107.1630666767.

The spelling of 1357171621 in words is "one billion, three hundred fifty-seven million, one hundred seventy-one thousand, six hundred twenty-one".