1521091 has 12 divisors (see below), whose sum is σ = 1802416. Its totient is φ = 1275120.

The previous prime is 1521089. The next prime is 1521103. The reversal of 1521091 is 1901251.

1521091 = 501² + 502² + ... + 506².

It is not a de Polignac number, because 1521091 - 2¹ = 1521089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1090 + ... + 2056.

2^1521091 is an apocalyptic number.

1521091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1521091 is a deficient number, since it is larger than the sum of its proper divisors (281325).

1521091 is a wasteful number, since it uses less digits than its factorization.

1521091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1521091 is about 1233.3251801532. The cubic root of 1521091 is about 115.0054439767.

The spelling of 1521091 in words is "one million, five hundred twenty-one thousand, ninety-one".