7151621 has 2 divisors, whose sum is σ = 7151622. Its totient is φ = 7151620.

The previous prime is 7151609. The next prime is 7151623. The reversal of 7151621 is 1261517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6558721 + 592900 = 2561^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 7151621 - 2¹⁴ = 7135237 is a prime.

It is a super-2 number, since 2×7151621² = 102291365855282, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 7151623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7151623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3575810 + 3575811.

It is an arithmetic number, because the mean of its divisors is an integer number (3575811).

Almost surely, 2^7151621 is an apocalyptic number.

It is an amenable number.

7151621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7151621 is an equidigital number, since it uses as much as digits as its factorization.

7151621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 7151621 is about 2674.2514840605. The cubic root of 7151621 is about 192.6644100554.

The spelling of 7151621 in words is "seven million, one hundred fifty-one thousand, six hundred twenty-one".