355001561 has 4 divisors (see below), whose sum is σ = 355055232. Its totient is φ = 354947892.

The previous prime is 355001539. The next prime is 355001597. The reversal of 355001561 is 165100553.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-355001561 is a prime.

It is a super-2 number, since 2×355001561² = 252052216624873442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 355001561.

It is not an unprimeable number, because it can be changed into a prime (355001501) 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, 15245 + ... + 30698.

It is an arithmetic number, because the mean of its divisors is an integer number (88763808).

Almost surely, 2^355001561 is an apocalyptic number.

It is an amenable number.

355001561 is a deficient number, since it is larger than the sum of its proper divisors (53671).

355001561 is an equidigital number, since it uses as much as digits as its factorization.

355001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53670.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 355001561 is about 18841.4851060101. The cubic root of 355001561 is about 708.0709129446.

The spelling of 355001561 in words is "three hundred fifty-five million, one thousand, five hundred sixty-one".