97021031 has 2 divisors, whose sum is σ = 97021032. Its totient is φ = 97021030.

The previous prime is 97021021. The next prime is 97021033. The reversal of 97021031 is 13012079.

It is a strong prime.

It is an emirp because it is prime and its reverse (13012079) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97021031 is a prime.

It is a super-2 number, since 2×97021031² = 18826160912605922, which contains 22 as substring.

Together with 97021033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 97020988 and 97021006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97021033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48510515 + 48510516.

It is an arithmetic number, because the mean of its divisors is an integer number (48510516).

Almost surely, 2^97021031 is an apocalyptic number.

97021031 is a deficient number, since it is larger than the sum of its proper divisors (1).

97021031 is an equidigital number, since it uses as much as digits as its factorization.

97021031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 97021031 is about 9849.9254311898. The cubic root of 97021031 is about 459.5032934034.

The spelling of 97021031 in words is "ninety-seven million, twenty-one thousand, thirty-one".