345521437 has 2 divisors, whose sum is σ = 345521438. Its totient is φ = 345521436.

The previous prime is 345521411. The next prime is 345521453. The reversal of 345521437 is 734125543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218034756 + 127486681 = 14766^2 + 11291^2 .

It is an emirp because it is prime and its reverse (734125543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345521437 - 2¹⁵ = 345488669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345521537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172760718 + 172760719.

It is an arithmetic number, because the mean of its divisors is an integer number (172760719).

Almost surely, 2^345521437 is an apocalyptic number.

It is an amenable number.

345521437 is a deficient number, since it is larger than the sum of its proper divisors (1).

345521437 is an equidigital number, since it uses as much as digits as its factorization.

345521437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 34.

The square root of 345521437 is about 18588.2069334296. The cubic root of 345521437 is about 701.7110773066.

The spelling of 345521437 in words is "three hundred forty-five million, five hundred twenty-one thousand, four hundred thirty-seven".