61850091 has 4 divisors (see below), whose sum is σ = 82466792. Its totient is φ = 41233392.

The previous prime is 61850081. The next prime is 61850101. The reversal of 61850091 is 19005816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61850081) and next prime (61850101).

It is not a de Polignac number, because 61850091 - 2⁶ = 61850027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61850071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10308346 + ... + 10308351.

It is an arithmetic number, because the mean of its divisors is an integer number (20616698).

Almost surely, 2^61850091 is an apocalyptic number.

61850091 is a deficient number, since it is larger than the sum of its proper divisors (20616701).

61850091 is a wasteful number, since it uses less digits than its factorization.

61850091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20616700.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 61850091 is about 7864.4828819192. The cubic root of 61850091 is about 395.4699123588.

The spelling of 61850091 in words is "sixty-one million, eight hundred fifty thousand, ninety-one".