61209401 has 16 divisors (see below), whose sum is σ = 73146240. Its totient is φ = 50561280.

The previous prime is 61209397. The next prime is 61209409. The reversal of 61209401 is 10490216.

It is a happy number.

It is not a de Polignac number, because 61209401 - 2² = 61209397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61209409) 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 15 ways as a sum of consecutive naturals, for example, 221 + ... + 11066.

It is an arithmetic number, because the mean of its divisors is an integer number (4571640).

Almost surely, 2^61209401 is an apocalyptic number.

It is an amenable number.

61209401 is a deficient number, since it is larger than the sum of its proper divisors (11936839).

61209401 is a wasteful number, since it uses less digits than its factorization.

61209401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11344.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 61209401 is about 7823.6437163255. The cubic root of 61209401 is about 394.0996445474.

Adding to 61209401 its reverse (10490216), we get a palindrome (71699617).

The spelling of 61209401 in words is "sixty-one million, two hundred nine thousand, four hundred one".