61269721 has 8 divisors (see below), whose sum is σ = 63790920. Its totient is φ = 58775808.

The previous prime is 61269709. The next prime is 61269763. The reversal of 61269721 is 12796216.

It can be written as a sum of positive squares in 4 ways, for example, as 24364096 + 36905625 = 4936^2 + 6075^2 .

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

It is not a de Polignac number, because 61269721 - 2¹¹ = 61267673 is a prime.

It is a super-2 number, since 2×61269721² = 7507957422835682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61269781) 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, 2176 + ... + 11281.

It is an arithmetic number, because the mean of its divisors is an integer number (7973865).

Almost surely, 2^61269721 is an apocalyptic number.

It is an amenable number.

61269721 is a deficient number, since it is larger than the sum of its proper divisors (2521199).

61269721 is a wasteful number, since it uses less digits than its factorization.

61269721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13643.

The product of its digits is 9072, while the sum is 34.

The square root of 61269721 is about 7827.4977483229. The cubic root of 61269721 is about 394.2290597764.

The spelling of 61269721 in words is "sixty-one million, two hundred sixty-nine thousand, seven hundred twenty-one".