90012397 has 2 divisors, whose sum is σ = 90012398. Its totient is φ = 90012396.

The previous prime is 90012361. The next prime is 90012401. The reversal of 90012397 is 79321009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76842756 + 13169641 = 8766^2 + 3629^2 .

It is an emirp because it is prime and its reverse (79321009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90012397 - 2⁷ = 90012269 is a prime.

It is a super-2 number, since 2×90012397² = 16204463227371218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90012337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45006198 + 45006199.

It is an arithmetic number, because the mean of its divisors is an integer number (45006199).

Almost surely, 2^90012397 is an apocalyptic number.

It is an amenable number.

90012397 is a deficient number, since it is larger than the sum of its proper divisors (1).

90012397 is an equidigital number, since it uses as much as digits as its factorization.

90012397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 90012397 is about 9487.4863372761. The cubic root of 90012397 is about 448.1610499979.

It can be divided in two parts, 90012 and 397, that added together give a palindrome (90409).

The spelling of 90012397 in words is "ninety million, twelve thousand, three hundred ninety-seven".