102661901 has 4 divisors (see below), whose sum is σ = 104598972. Its totient is φ = 100724832.

The previous prime is 102661891. The next prime is 102661907. The reversal of 102661901 is 109166201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70728100 + 31933801 = 8410^2 + 5651^2 .

It is a cyclic number.

It is not a de Polignac number, because 102661901 - 2⁶ = 102661837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102661907) 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, 968456 + ... + 968561.

It is an arithmetic number, because the mean of its divisors is an integer number (26149743).

Almost surely, 2^102661901 is an apocalyptic number.

It is an amenable number.

102661901 is a deficient number, since it is larger than the sum of its proper divisors (1937071).

102661901 is an equidigital number, since it uses as much as digits as its factorization.

102661901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937070.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 102661901 is about 10132.2209312667. The cubic root of 102661901 is about 468.2413543725.

It can be divided in two parts, 10266 and 1901, that added together give a cube (12167 = 23³).

The spelling of 102661901 in words is "one hundred two million, six hundred sixty-one thousand, nine hundred one".