61401145 has 32 divisors (see below), whose sum is σ = 84172032. Its totient is φ = 42653952.

The previous prime is 61401143. The next prime is 61401169. The reversal of 61401145 is 54110416.

61401145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61401145 - 2¹ = 61401143 is a prime.

It is a super-2 number, since 2×61401145² = 7540201214622050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61401143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99859 + ... + 100471.

It is an arithmetic number, because the mean of its divisors is an integer number (2630376).

Almost surely, 2^61401145 is an apocalyptic number.

61401145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61401145 is a deficient number, since it is larger than the sum of its proper divisors (22770887).

61401145 is a wasteful number, since it uses less digits than its factorization.

61401145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 61401145 is about 7835.8882712811. Note that the first 3 decimals coincide. The cubic root of 61401145 is about 394.5107332147.

The spelling of 61401145 in words is "sixty-one million, four hundred one thousand, one hundred forty-five".