61220145 has 32 divisors (see below), whose sum is σ = 118533888. Its totient is φ = 26339328.

The previous prime is 61220143. The next prime is 61220153. The reversal of 61220145 is 54102216.

It is not a de Polignac number, because 61220145 - 2¹ = 61220143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (61220143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15364 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (3704184).

Almost surely, 2^61220145 is an apocalyptic number.

It is an amenable number.

61220145 is a deficient number, since it is larger than the sum of its proper divisors (57313743).

61220145 is a wasteful number, since it uses less digits than its factorization.

61220145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34329.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 61220145 is about 7824.3303227816. The cubic root of 61220145 is about 394.1227017837.

The spelling of 61220145 in words is "sixty-one million, two hundred twenty thousand, one hundred forty-five".