1061521501 has 4 divisors (see below), whose sum is σ = 1062235900. Its totient is φ = 1060807104.

The previous prime is 1061521493. The next prime is 1061521519. The reversal of 1061521501 is 1051251601.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301196025 + 760325476 = 17355^2 + 27574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061521501 - 2³ = 1061521493 is a prime.

It is a super-2 number, since 2×1061521501² = 2253655794170586002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061527501) 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, 354966 + ... + 357943.

It is an arithmetic number, because the mean of its divisors is an integer number (265558975).

Almost surely, 2^1061521501 is an apocalyptic number.

It is an amenable number.

1061521501 is a deficient number, since it is larger than the sum of its proper divisors (714399).

1061521501 is an equidigital number, since it uses as much as digits as its factorization.

1061521501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714398.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1061521501 is about 32580.9990792179. Note that the first 3 decimals coincide. The cubic root of 1061521501 is about 1020.1004325688.

The spelling of 1061521501 in words is "one billion, sixty-one million, five hundred twenty-one thousand, five hundred one".