61242131 has 4 divisors (see below), whose sum is σ = 61980072. Its totient is φ = 60504192.

The previous prime is 61242119. The next prime is 61242133. The reversal of 61242131 is 13124216.

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

It is a cyclic number.

It is not a de Polignac number, because 61242131 - 2¹⁰ = 61241107 is a prime.

It is a super-2 number, since 2×61242131² = 7501197218842322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61242133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368846 + ... + 369011.

It is an arithmetic number, because the mean of its divisors is an integer number (15495018).

Almost surely, 2^61242131 is an apocalyptic number.

61242131 is a deficient number, since it is larger than the sum of its proper divisors (737941).

61242131 is an equidigital number, since it uses as much as digits as its factorization.

61242131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737940.

The product of its digits is 288, while the sum is 20.

The square root of 61242131 is about 7825.7351731323. The cubic root of 61242131 is about 394.1698765855.

Adding to 61242131 its reverse (13124216), we get a palindrome (74366347).

The spelling of 61242131 in words is "sixty-one million, two hundred forty-two thousand, one hundred thirty-one".