61800451 has 2 divisors, whose sum is σ = 61800452. Its totient is φ = 61800450.

The previous prime is 61800437. The next prime is 61800463. The reversal of 61800451 is 15400816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61800451 - 2⁵ = 61800419 is a prime.

It is not a weakly prime, because it can be changed into another prime (61800251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900225 + 30900226.

It is an arithmetic number, because the mean of its divisors is an integer number (30900226).

Almost surely, 2^61800451 is an apocalyptic number.

61800451 is a deficient number, since it is larger than the sum of its proper divisors (1).

61800451 is an equidigital number, since it uses as much as digits as its factorization.

61800451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 61800451 is about 7861.3262875930. The cubic root of 61800451 is about 395.3640845400.

The spelling of 61800451 in words is "sixty-one million, eight hundred thousand, four hundred fifty-one".