1011521551 has 8 divisors (see below), whose sum is σ = 1039960064. Its totient is φ = 983306520.

The previous prime is 1011521543. The next prime is 1011521561. The reversal of 1011521551 is 1551251101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011521551 - 2³ = 1011521543 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 (1011521561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46671 + ... + 64816.

It is an arithmetic number, because the mean of its divisors is an integer number (129995008).

Almost surely, 2^1011521551 is an apocalyptic number.

1011521551 is a deficient number, since it is larger than the sum of its proper divisors (28438513).

1011521551 is a wasteful number, since it uses less digits than its factorization.

1011521551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111741.

The product of its (nonzero) digits is 250, while the sum is 22.

The square root of 1011521551 is about 31804.4265944224. The cubic root of 1011521551 is about 1003.8258611200.

Adding to 1011521551 its reverse (1551251101), we get a palindrome (2562772652).

The spelling of 1011521551 in words is "one billion, eleven million, five hundred twenty-one thousand, five hundred fifty-one".