61031121 has 16 divisors (see below), whose sum is σ = 85155840. Its totient is φ = 38807120.

The previous prime is 61031119. The next prime is 61031129. The reversal of 61031121 is 12113016.

It is a cyclic number.

It is not a de Polignac number, because 61031121 - 2¹ = 61031119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61031121.

It is not an unprimeable number, because it can be changed into a prime (61031129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27856 + ... + 29966.

It is an arithmetic number, because the mean of its divisors is an integer number (5322240).

Almost surely, 2^61031121 is an apocalyptic number.

It is an amenable number.

61031121 is a deficient number, since it is larger than the sum of its proper divisors (24124719).

61031121 is a wasteful number, since it uses less digits than its factorization.

61031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 61031121 is about 7812.2417397313. The cubic root of 61031121 is about 393.7166510430.

Adding to 61031121 its reverse (12113016), we get a palindrome (73144137).

The spelling of 61031121 in words is "sixty-one million, thirty-one thousand, one hundred twenty-one".