61540403 has 2 divisors, whose sum is σ = 61540404. Its totient is φ = 61540402.

The previous prime is 61540351. The next prime is 61540417. The reversal of 61540403 is 30404516.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61540403 - 2⁸ = 61540147 is a prime.

It is not a weakly prime, because it can be changed into another prime (61540463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30770201 + 30770202.

It is an arithmetic number, because the mean of its divisors is an integer number (30770202).

Almost surely, 2^61540403 is an apocalyptic number.

61540403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61540403 is an equidigital number, since it uses as much as digits as its factorization.

61540403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 61540403 is about 7844.7691489298. The cubic root of 61540403 is about 394.8087585700.

Adding to 61540403 its reverse (30404516), we get a palindrome (91944919).

The spelling of 61540403 in words is "sixty-one million, five hundred forty thousand, four hundred three".