97421309 has 4 divisors (see below), whose sum is σ = 97783740. Its totient is φ = 97058880.

The previous prime is 97421297. The next prime is 97421327. The reversal of 97421309 is 90312479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90312479 = 2423 ⋅37273.

It can be written as a sum of positive squares in 2 ways, for example, as 1968409 + 95452900 = 1403^2 + 9770^2 .

It is a cyclic number.

It is not a de Polignac number, because 97421309 - 2²⁴ = 80644093 is a prime.

It is a super-2 number, since 2×97421309² = 18981822894546962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97421329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180812 + ... + 181349.

It is an arithmetic number, because the mean of its divisors is an integer number (24445935).

Almost surely, 2^97421309 is an apocalyptic number.

It is an amenable number.

97421309 is a deficient number, since it is larger than the sum of its proper divisors (362431).

97421309 is a wasteful number, since it uses less digits than its factorization.

97421309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362430.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 97421309 is about 9870.2233510696. The cubic root of 97421309 is about 460.1343479670.

The spelling of 97421309 in words is "ninety-seven million, four hundred twenty-one thousand, three hundred nine".