1090523857 has 4 divisors (see below), whose sum is σ = 1092252736. Its totient is φ = 1088794980.

The previous prime is 1090523843. The next prime is 1090523873. The reversal of 1090523857 is 7583250901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7583250901 = 307 ⋅24701143.

It is a cyclic number.

It is not a de Polignac number, because 1090523857 - 2⁷ = 1090523729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1090523827) 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, 863493 + ... + 864754.

It is an arithmetic number, because the mean of its divisors is an integer number (273063184).

Almost surely, 2^1090523857 is an apocalyptic number.

It is an amenable number.

1090523857 is a deficient number, since it is larger than the sum of its proper divisors (1728879).

1090523857 is an equidigital number, since it uses as much as digits as its factorization.

1090523857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728878.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 1090523857 is about 33023.0806709489. The cubic root of 1090523857 is about 1029.3073097336.

The spelling of 1090523857 in words is "one billion, ninety million, five hundred twenty-three thousand, eight hundred fifty-seven".