345721501 has 4 divisors (see below), whose sum is σ = 346462272. Its totient is φ = 344980732.

The previous prime is 345721463. The next prime is 345721531. The reversal of 345721501 is 105127543.

It is a happy number.

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 not a de Polignac number, because 345721501 - 2¹⁷ = 345590429 is a prime.

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 345721501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345721531) 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, 369685 + ... + 370618.

It is an arithmetic number, because the mean of its divisors is an integer number (86615568).

Almost surely, 2^345721501 is an apocalyptic number.

It is an amenable number.

345721501 is a deficient number, since it is larger than the sum of its proper divisors (740771).

345721501 is an equidigital number, since it uses as much as digits as its factorization.

345721501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740770.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 345721501 is about 18593.5876312238. The cubic root of 345721501 is about 701.8464862113.

The spelling of 345721501 in words is "three hundred forty-five million, seven hundred twenty-one thousand, five hundred one".