1355974981 has 2 divisors, whose sum is σ = 1355974982. Its totient is φ = 1355974980.

The previous prime is 1355974967. The next prime is 1355974987. The reversal of 1355974981 is 1894795531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 933302500 + 422672481 = 30550^2 + 20559^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355974981 - 2²⁵ = 1322420549 is a prime.

It is a super-2 number, since 2×1355974981² = 3677336298195900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1355974987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677987490 + 677987491.

It is an arithmetic number, because the mean of its divisors is an integer number (677987491).

Almost surely, 2^1355974981 is an apocalyptic number.

It is an amenable number.

1355974981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355974981 is an equidigital number, since it uses as much as digits as its factorization.

1355974981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

The square root of 1355974981 is about 36823.5655660882. The cubic root of 1355974981 is about 1106.8375698443.

The spelling of 1355974981 in words is "one billion, three hundred fifty-five million, nine hundred seventy-four thousand, nine hundred eighty-one".