63430991 has 16 divisors (see below), whose sum is σ = 71221248. Its totient is φ = 56095200.

The previous prime is 63430981. The next prime is 63430993. The reversal of 63430991 is 19903436.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63430991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63430993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42386 + ... + 43856.

It is an arithmetic number, because the mean of its divisors is an integer number (4451328).

Almost surely, 2^63430991 is an apocalyptic number.

63430991 is a deficient number, since it is larger than the sum of its proper divisors (7790257).

63430991 is a wasteful number, since it uses less digits than its factorization.

63430991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 63430991 is about 7964.3575384333. The cubic root of 63430991 is about 398.8110339845.

The spelling of 63430991 in words is "sixty-three million, four hundred thirty thousand, nine hundred ninety-one".