1157707821 has 16 divisors (see below), whose sum is σ = 1563903936. Its totient is φ = 761678976.

The previous prime is 1157707813. The next prime is 1157707823. The reversal of 1157707821 is 1287077511.

It is not a de Polignac number, because 1157707821 - 2³ = 1157707813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1157707821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157707823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300121 + ... + 303953.

It is an arithmetic number, because the mean of its divisors is an integer number (97743996).

Almost surely, 2^1157707821 is an apocalyptic number.

It is an amenable number.

1157707821 is a deficient number, since it is larger than the sum of its proper divisors (406196115).

1157707821 is a wasteful number, since it uses less digits than its factorization.

1157707821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132.

The product of its (nonzero) digits is 27440, while the sum is 39.

The square root of 1157707821 is about 34025.1057456108. The cubic root of 1157707821 is about 1050.0250397657.

The spelling of 1157707821 in words is "one billion, one hundred fifty-seven million, seven hundred seven thousand, eight hundred twenty-one".