97755421 has 2 divisors, whose sum is σ = 97755422. Its totient is φ = 97755420.

The previous prime is 97755403. The next prime is 97755461. The reversal of 97755421 is 12455779.

It is an a-pointer prime, because the next prime (97755461) can be obtained adding 97755421 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96727225 + 1028196 = 9835^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 97755421 - 2⁷ = 97755293 is a prime.

It is a super-2 number, since 2×97755421² = 19112244669774482, which contains 22 as substring.

It is equal to p_5639692 and since 97755421 and 5639692 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97755461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48877710 + 48877711.

It is an arithmetic number, because the mean of its divisors is an integer number (48877711).

Almost surely, 2^97755421 is an apocalyptic number.

It is an amenable number.

97755421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97755421 is an equidigital number, since it uses as much as digits as its factorization.

97755421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 40.

The square root of 97755421 is about 9887.1341145956. The cubic root of 97755421 is about 460.6597668705.

The spelling of 97755421 in words is "ninety-seven million, seven hundred fifty-five thousand, four hundred twenty-one".