1961674321 has 2 divisors, whose sum is σ = 1961674322. Its totient is φ = 1961674320.

The previous prime is 1961674313. The next prime is 1961674343. The reversal of 1961674321 is 1234761691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1741893696 + 219780625 = 41736^2 + 14825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961674321 - 2³ = 1961674313 is a prime.

It is a super-2 number, since 2×1961674321² = 7696332283341622082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1961674381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980837160 + 980837161.

It is an arithmetic number, because the mean of its divisors is an integer number (980837161).

Almost surely, 2^1961674321 is an apocalyptic number.

It is an amenable number.

1961674321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961674321 is an equidigital number, since it uses as much as digits as its factorization.

1961674321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 1961674321 is about 44290.7927339306. The cubic root of 1961674321 is about 1251.8212004412.

The spelling of 1961674321 in words is "one billion, nine hundred sixty-one million, six hundred seventy-four thousand, three hundred twenty-one".