1251652765 has 16 divisors (see below), whose sum is σ = 1639227456. Its totient is φ = 909904000.

The previous prime is 1251652763. The next prime is 1251652771. The reversal of 1251652765 is 5672561521.

It is not a de Polignac number, because 1251652765 - 2¹ = 1251652763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251652763) 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, 212865 + ... + 218665.

It is an arithmetic number, because the mean of its divisors is an integer number (102451716).

Almost surely, 2^1251652765 is an apocalyptic number.

It is an amenable number.

1251652765 is a deficient number, since it is larger than the sum of its proper divisors (387574691).

1251652765 is a wasteful number, since it uses less digits than its factorization.

1251652765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740.

The product of its digits is 126000, while the sum is 40.

The square root of 1251652765 is about 35378.7049649927. The cubic root of 1251652765 is about 1077.6919058208.

The spelling of 1251652765 in words is "one billion, two hundred fifty-one million, six hundred fifty-two thousand, seven hundred sixty-five".