351253621 has 2 divisors, whose sum is σ = 351253622. Its totient is φ = 351253620.

The previous prime is 351253603. The next prime is 351253649. The reversal of 351253621 is 126352153.

It is an a-pointer prime, because the next prime (351253649) can be obtained adding 351253621 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296700625 + 54552996 = 17225^2 + 7386^2 .

It is a cyclic number.

It is not a de Polignac number, because 351253621 - 2¹⁷ = 351122549 is a prime.

It is a super-2 number, since 2×351253621² = 246758212531223282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 351253621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351253681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175626810 + 175626811.

It is an arithmetic number, because the mean of its divisors is an integer number (175626811).

Almost surely, 2^351253621 is an apocalyptic number.

It is an amenable number.

351253621 is a deficient number, since it is larger than the sum of its proper divisors (1).

351253621 is an equidigital number, since it uses as much as digits as its factorization.

351253621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 28.

The square root of 351253621 is about 18741.7614166865. The cubic root of 351253621 is about 705.5702650851.

The spelling of 351253621 in words is "three hundred fifty-one million, two hundred fifty-three thousand, six hundred twenty-one".