1061503721 has 4 divisors (see below), whose sum is σ = 1063589700. Its totient is φ = 1059417744.

The previous prime is 1061503699. The next prime is 1061503727. The reversal of 1061503721 is 1273051601.

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 946177600 + 115326121 = 30760^2 + 10739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061503721 - 2⁶ = 1061503657 is a prime.

It is a super-2 number, since 2×1061503721² = 2253580299393691682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061503727) 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, 1042226 + ... + 1043243.

It is an arithmetic number, because the mean of its divisors is an integer number (265897425).

Almost surely, 2^1061503721 is an apocalyptic number.

It is an amenable number.

1061503721 is a deficient number, since it is larger than the sum of its proper divisors (2085979).

1061503721 is an equidigital number, since it uses as much as digits as its factorization.

1061503721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085978.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1061503721 is about 32580.7262196532. The cubic root of 1061503721 is about 1020.0947371316.

The spelling of 1061503721 in words is "one billion, sixty-one million, five hundred three thousand, seven hundred twenty-one".