7145621 has 6 divisors (see below), whose sum is σ = 8312310. Its totient is φ = 6124776.

The previous prime is 7145609. The next prime is 7145623. The reversal of 7145621 is 1265417.

It can be written as a sum of positive squares in only one way, i.e., 4708900 + 2436721 = 2170^2 + 1561^2 .

It is not a de Polignac number, because 7145621 - 2⁶ = 7145557 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7145623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72866 + ... + 72963.

It is an arithmetic number, because the mean of its divisors is an integer number (1385385).

Almost surely, 2^7145621 is an apocalyptic number.

It is an amenable number.

7145621 is a deficient number, since it is larger than the sum of its proper divisors (1166689).

7145621 is a wasteful number, since it uses less digits than its factorization.

7145621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145843 (or 145836 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 7145621 is about 2673.1294394398. The cubic root of 7145621 is about 192.6105150531.

The spelling of 7145621 in words is "seven million, one hundred forty-five thousand, six hundred twenty-one".