61031054261 has 16 divisors (see below), whose sum is σ = 63403494000. Its totient is φ = 58699219968.

The previous prime is 61031054251. The next prime is 61031054303. The reversal of 61031054261 is 16245013016.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2033559025 + 58997495236 = 45095^2 + 242894^2 .

It is a cyclic number.

It is not a de Polignac number, because 61031054261 - 2⁶ = 61031054197 is a prime.

It is a super-2 number, since 2×61031054261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61031054251) 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, 1728815 + ... + 1763763.

It is an arithmetic number, because the mean of its divisors is an integer number (3962718375).

Almost surely, 2^61031054261 is an apocalyptic number.

It is an amenable number.

61031054261 is a deficient number, since it is larger than the sum of its proper divisors (2372439739).

61031054261 is a wasteful number, since it uses less digits than its factorization.

61031054261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35528.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 61031054261 its reverse (16245013016), we get a palindrome (77276067277).

The spelling of 61031054261 in words is "sixty-one billion, thirty-one million, fifty-four thousand, two hundred sixty-one".