61281001 has 2 divisors, whose sum is σ = 61281002. Its totient is φ = 61281000.

The previous prime is 61280981. The next prime is 61281007. The reversal of 61281001 is 10018216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 10086976 = 7155^2 + 3176^2 .

It is a cyclic number.

It is not a de Polignac number, because 61281001 - 2⁹ = 61280489 is a prime.

It is a super-2 number, since 2×61281001² = 7510722167124002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61281001.

It is not a weakly prime, because it can be changed into another prime (61281007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640500 + 30640501.

It is an arithmetic number, because the mean of its divisors is an integer number (30640501).

Almost surely, 2^61281001 is an apocalyptic number.

It is an amenable number.

61281001 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281001 is an equidigital number, since it uses as much as digits as its factorization.

61281001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 61281001 is about 7828.2182519396. The cubic root of 61281001 is about 394.2532513393.

Adding to 61281001 its reverse (10018216), we get a palindrome (71299217).

The spelling of 61281001 in words is "sixty-one million, two hundred eighty-one thousand, one".