145220061 has 16 divisors (see below), whose sum is σ = 221493888. Its totient is φ = 82905600.

The previous prime is 145220057. The next prime is 145220087. The reversal of 145220061 is 160022541.

It is not a de Polignac number, because 145220061 - 2² = 145220057 is a prime.

It is a super-2 number, since 2×145220061² = 42177732233687442, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220041) 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, 26041 + ... + 31121.

It is an arithmetic number, because the mean of its divisors is an integer number (13843368).

Almost surely, 2^145220061 is an apocalyptic number.

It is an amenable number.

145220061 is a deficient number, since it is larger than the sum of its proper divisors (76273827).

145220061 is a wasteful number, since it uses less digits than its factorization.

145220061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452.

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

The square root of 145220061 is about 12050.7286501688. The cubic root of 145220061 is about 525.6244252797.

The spelling of 145220061 in words is "one hundred forty-five million, two hundred twenty thousand, sixty-one".