102561145 has 16 divisors (see below), whose sum is σ = 129896640. Its totient is φ = 77523264.

The previous prime is 102561143. The next prime is 102561167. The reversal of 102561145 is 541165201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 102561145 - 2¹ = 102561143 is a prime.

It is a super-2 number, since 2×102561145² = 21037576927422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102561143) 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, 40867 + ... + 43303.

It is an arithmetic number, because the mean of its divisors is an integer number (8118540).

Almost surely, 2^102561145 is an apocalyptic number.

It is an amenable number.

102561145 is a deficient number, since it is larger than the sum of its proper divisors (27335495).

102561145 is a wasteful number, since it uses less digits than its factorization.

102561145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 102561145 is about 10127.2476517561. The cubic root of 102561145 is about 468.0881213881.

The spelling of 102561145 in words is "one hundred two million, five hundred sixty-one thousand, one hundred forty-five".