61292821 has 2 divisors, whose sum is σ = 61292822. Its totient is φ = 61292820.

The previous prime is 61292801. The next prime is 61292843. The reversal of 61292821 is 12829216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34398225 + 26894596 = 5865^2 + 5186^2 .

It is a cyclic number.

It is not a de Polignac number, because 61292821 - 2¹⁵ = 61260053 is a prime.

It is a super-2 number, since 2×61292821² = 7513619812276082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61292801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30646410 + 30646411.

It is an arithmetic number, because the mean of its divisors is an integer number (30646411).

Almost surely, 2^61292821 is an apocalyptic number.

It is an amenable number.

61292821 is a deficient number, since it is larger than the sum of its proper divisors (1).

61292821 is an equidigital number, since it uses as much as digits as its factorization.

61292821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 61292821 is about 7828.9731766050. The cubic root of 61292821 is about 394.2785978239.

The spelling of 61292821 in words is "sixty-one million, two hundred ninety-two thousand, eight hundred twenty-one".