7540861 has 2 divisors, whose sum is σ = 7540862. Its totient is φ = 7540860.

The previous prime is 7540837. The next prime is 7540873. The reversal of 7540861 is 1680457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 1038361 = 2550^2 + 1019^2 .

It is an emirp because it is prime and its reverse (1680457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7540861 - 2⁹ = 7540349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7540801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3770430 + 3770431.

It is an arithmetic number, because the mean of its divisors is an integer number (3770431).

Almost surely, 2^7540861 is an apocalyptic number.

It is an amenable number.

7540861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7540861 is an equidigital number, since it uses as much as digits as its factorization.

7540861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 7540861 is about 2746.0628179268. The cubic root of 7540861 is about 196.0982171218.

The spelling of 7540861 in words is "seven million, five hundred forty thousand, eight hundred sixty-one".