1061721231 has 16 divisors (see below), whose sum is σ = 1422091008. Its totient is φ = 704592000.

The previous prime is 1061721229. The next prime is 1061721257. The reversal of 1061721231 is 1321271601.

It is not a de Polignac number, because 1061721231 - 2¹ = 1061721229 is a prime.

It is a super-2 number, since 2×1061721231² = 2254503944712310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061721131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883431 + ... + 884631.

It is an arithmetic number, because the mean of its divisors is an integer number (88880688).

Almost surely, 2^1061721231 is an apocalyptic number.

1061721231 is a deficient number, since it is larger than the sum of its proper divisors (360369777).

1061721231 is a wasteful number, since it uses less digits than its factorization.

1061721231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1061721231 is about 32584.0640651224. The cubic root of 1061721231 is about 1020.1644073704.

Adding to 1061721231 its reverse (1321271601), we get a palindrome (2382992832).

The spelling of 1061721231 in words is "one billion, sixty-one million, seven hundred twenty-one thousand, two hundred thirty-one".