90439451 has 2 divisors, whose sum is σ = 90439452. Its totient is φ = 90439450.

The previous prime is 90439423. The next prime is 90439457. The reversal of 90439451 is 15493409.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90439451 is a prime.

It is not a weakly prime, because it can be changed into another prime (90439457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219725 + 45219726.

It is an arithmetic number, because the mean of its divisors is an integer number (45219726).

Almost surely, 2^90439451 is an apocalyptic number.

90439451 is a deficient number, since it is larger than the sum of its proper divisors (1).

90439451 is an equidigital number, since it uses as much as digits as its factorization.

90439451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 90439451 is about 9509.9658779619. The cubic root of 90439451 is about 448.8686824870.

The spelling of 90439451 in words is "ninety million, four hundred thirty-nine thousand, four hundred fifty-one".