345621401 has 4 divisors (see below), whose sum is σ = 353659152. Its totient is φ = 337583652.

The previous prime is 345621389. The next prime is 345621413. The reversal of 345621401 is 104126543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (345621389) and next prime (345621413).

It is a cyclic number.

It is not a de Polignac number, because 345621401 - 2⁶ = 345621337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345621481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4018811 + ... + 4018896.

It is an arithmetic number, because the mean of its divisors is an integer number (88414788).

Almost surely, 2^345621401 is an apocalyptic number.

It is an amenable number.

345621401 is a deficient number, since it is larger than the sum of its proper divisors (8037751).

345621401 is an equidigital number, since it uses as much as digits as its factorization.

345621401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8037750.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 345621401 is about 18590.8956481392. The cubic root of 345621401 is about 701.7787422665.

Adding to 345621401 its reverse (104126543), we get a palindrome (449747944).

The spelling of 345621401 in words is "three hundred forty-five million, six hundred twenty-one thousand, four hundred one".