7121377 has 2 divisors, whose sum is σ = 7121378. Its totient is φ = 7121376.

The previous prime is 7121357. The next prime is 7121399. The reversal of 7121377 is 7731217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3721041 + 3400336 = 1929^2 + 1844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7121377 is a prime.

It is a super-2 number, since 2×7121377² = 101428020752258, which contains 22 as substring.

It is an Ulam number.

7121377 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7121347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560688 + 3560689.

It is an arithmetic number, because the mean of its divisors is an integer number (3560689).

Almost surely, 2^7121377 is an apocalyptic number.

It is an amenable number.

7121377 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121377 is an equidigital number, since it uses as much as digits as its factorization.

7121377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2058, while the sum is 28.

The square root of 7121377 is about 2668.5908266349. The cubic root of 7121377 is about 192.3924355496.

The spelling of 7121377 in words is "seven million, one hundred twenty-one thousand, three hundred seventy-seven".