145377561 has 12 divisors (see below), whose sum is σ = 225483792. Its totient is φ = 83072808.

The previous prime is 145377559. The next prime is 145377611. The reversal of 145377561 is 165773541.

It is not a de Polignac number, because 145377561 - 2¹ = 145377559 is a prime.

It is a super-2 number, since 2×145377561² = 42269270484617442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145377521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 494335 + ... + 494628.

It is an arithmetic number, because the mean of its divisors is an integer number (18790316).

Almost surely, 2^145377561 is an apocalyptic number.

It is an amenable number.

145377561 is a deficient number, since it is larger than the sum of its proper divisors (80106231).

145377561 is an equidigital number, since it uses as much as digits as its factorization.

145377561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988980 (or 988973 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 145377561 is about 12057.2617538146. The cubic root of 145377561 is about 525.8143805234.

The spelling of 145377561 in words is "one hundred forty-five million, three hundred seventy-seven thousand, five hundred sixty-one".