90533731 has 2 divisors, whose sum is σ = 90533732. Its totient is φ = 90533730.

The previous prime is 90533719. The next prime is 90533747. The reversal of 90533731 is 13733509.

It is a weak prime.

It is an emirp because it is prime and its reverse (13733509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90533731 - 2¹⁷ = 90402659 is a prime.

It is a super-2 number, since 2×90533731² = 16392712897560722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90533693 and 90533702.

It is not a weakly prime, because it can be changed into another prime (90533761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45266865 + 45266866.

It is an arithmetic number, because the mean of its divisors is an integer number (45266866).

Almost surely, 2^90533731 is an apocalyptic number.

90533731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90533731 is an equidigital number, since it uses as much as digits as its factorization.

90533731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 31.

The square root of 90533731 is about 9514.9214920566. The cubic root of 90533731 is about 449.0246050111.

The spelling of 90533731 in words is "ninety million, five hundred thirty-three thousand, seven hundred thirty-one".