102001561507 has 4 divisors (see below), whose sum is σ = 102005138016. Its totient is φ = 101997985000.

The previous prime is 102001561489. The next prime is 102001561511. The reversal of 102001561507 is 705165100201.

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

It is a cyclic number.

It is not a de Polignac number, because 102001561507 - 2¹¹ = 102001559459 is a prime.

It is a super-2 number, since 2×102001561507² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102001568507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745128 + ... + 1802629.

It is an arithmetic number, because the mean of its divisors is an integer number (25501284504).

Almost surely, 2^102001561507 is an apocalyptic number.

102001561507 is a deficient number, since it is larger than the sum of its proper divisors (3576509).

102001561507 is an equidigital number, since it uses as much as digits as its factorization.

102001561507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576508.

The product of its (nonzero) digits is 2100, while the sum is 28.

Adding to 102001561507 its reverse (705165100201), we get a palindrome (807166661708).

The spelling of 102001561507 in words is "one hundred two billion, one million, five hundred sixty-one thousand, five hundred seven".