61767421 has 2 divisors, whose sum is σ = 61767422. Its totient is φ = 61767420.

The previous prime is 61767413. The next prime is 61767457. The reversal of 61767421 is 12476716.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55666521 + 6100900 = 7461^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 61767421 - 2³ = 61767413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61767491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30883710 + 30883711.

It is an arithmetic number, because the mean of its divisors is an integer number (30883711).

Almost surely, 2^61767421 is an apocalyptic number.

It is an amenable number.

61767421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61767421 is an equidigital number, since it uses as much as digits as its factorization.

61767421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 61767421 is about 7859.2252162666. The cubic root of 61767421 is about 395.2936362790.

The spelling of 61767421 in words is "sixty-one million, seven hundred sixty-seven thousand, four hundred twenty-one".