145167561 has 24 divisors (see below), whose sum is σ = 261428544. Its totient is φ = 75411360.

The previous prime is 145167557. The next prime is 145167563. The reversal of 145167561 is 165761541.

It is a happy number.

145167561 is a `hidden beast` number, since 14 + 516 + 75 + 61 = 666.

It is not a de Polignac number, because 145167561 - 2² = 145167557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145167563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104046 + ... + 105431.

It is an arithmetic number, because the mean of its divisors is an integer number (10892856).

Almost surely, 2^145167561 is an apocalyptic number.

145167561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145167561 is a deficient number, since it is larger than the sum of its proper divisors (116260983).

145167561 is a wasteful number, since it uses less digits than its factorization.

145167561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209501 (or 209498 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 145167561 is about 12048.5501617415. The cubic root of 145167561 is about 525.5610763451.

The spelling of 145167561 in words is "one hundred forty-five million, one hundred sixty-seven thousand, five hundred sixty-one".