145017961 has 4 divisors (see below), whose sum is σ = 158201424. Its totient is φ = 131834500.

The previous prime is 145017953. The next prime is 145017991. The reversal of 145017961 is 169710541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145017961 - 2³ = 145017953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145017941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6591715 + ... + 6591736.

It is an arithmetic number, because the mean of its divisors is an integer number (39550356).

Almost surely, 2^145017961 is an apocalyptic number.

145017961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145017961 is a deficient number, since it is larger than the sum of its proper divisors (13183463).

145017961 is a wasteful number, since it uses less digits than its factorization.

145017961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13183462.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 145017961 is about 12042.3403456305. The cubic root of 145017961 is about 525.3804782369.

The spelling of 145017961 in words is "one hundred forty-five million, seventeen thousand, nine hundred sixty-one".