997651253 has 2 divisors, whose sum is σ = 997651254. Its totient is φ = 997651252.

The previous prime is 997651231. The next prime is 997651261. The reversal of 997651253 is 352156799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 964909969 + 32741284 = 31063^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 997651253 - 2⁶ = 997651189 is a prime.

It is a super-2 number, since 2×997651253² = 1990616045224940018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 997651198 and 997651207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997651223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498825626 + 498825627.

It is an arithmetic number, because the mean of its divisors is an integer number (498825627).

Almost surely, 2^997651253 is an apocalyptic number.

It is an amenable number.

997651253 is a deficient number, since it is larger than the sum of its proper divisors (1).

997651253 is an equidigital number, since it uses as much as digits as its factorization.

997651253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 47.

The square root of 997651253 is about 31585.6178188745. The cubic root of 997651253 is about 999.2164705753.

The spelling of 997651253 in words is "nine hundred ninety-seven million, six hundred fifty-one thousand, two hundred fifty-three".