1251106606 has 4 divisors (see below), whose sum is σ = 1876659912. Its totient is φ = 625553302.

The previous prime is 1251106589. The next prime is 1251106607. The reversal of 1251106606 is 6066011521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6066011521 = 31 ⋅195677791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251106607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312776650 + ... + 312776653.

It is an arithmetic number, because the mean of its divisors is an integer number (469164978).

Almost surely, 2^1251106606 is an apocalyptic number.

1251106606 is a deficient number, since it is larger than the sum of its proper divisors (625553306).

1251106606 is an equidigital number, since it uses as much as digits as its factorization.

1251106606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625553305.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1251106606 is about 35370.9853693674. The cubic root of 1251106606 is about 1077.5351326375.

The spelling of 1251106606 in words is "one billion, two hundred fifty-one million, one hundred six thousand, six hundred six".