405451261 has 2 divisors, whose sum is σ = 405451262. Its totient is φ = 405451260.

The previous prime is 405451231. The next prime is 405451273. The reversal of 405451261 is 162154504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261307225 + 144144036 = 16165^2 + 12006^2 .

It is a cyclic number.

It is not a de Polignac number, because 405451261 - 2⁵ = 405451229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405451231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202725630 + 202725631.

It is an arithmetic number, because the mean of its divisors is an integer number (202725631).

Almost surely, 2^405451261 is an apocalyptic number.

It is an amenable number.

405451261 is a deficient number, since it is larger than the sum of its proper divisors (1).

405451261 is an equidigital number, since it uses as much as digits as its factorization.

405451261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 405451261 is about 20135.8203458414. The cubic root of 405451261 is about 740.1383117412.

The spelling of 405451261 in words is "four hundred five million, four hundred fifty-one thousand, two hundred sixty-one".