61881451 has 2 divisors, whose sum is σ = 61881452. Its totient is φ = 61881450.

The previous prime is 61881439. The next prime is 61881481. The reversal of 61881451 is 15418816.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61881451 - 2⁵ = 61881419 is a prime.

It is not a weakly prime, because it can be changed into another prime (61881481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30940725 + 30940726.

It is an arithmetic number, because the mean of its divisors is an integer number (30940726).

Almost surely, 2^61881451 is an apocalyptic number.

61881451 is a deficient number, since it is larger than the sum of its proper divisors (1).

61881451 is an equidigital number, since it uses as much as digits as its factorization.

61881451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 34.

The square root of 61881451 is about 7866.4764030664. The cubic root of 61881451 is about 395.5367397516.

The spelling of 61881451 in words is "sixty-one million, eight hundred eighty-one thousand, four hundred fifty-one".